"jä" meaning in Saterland Frisian

{
  "etymology_templates": [
    {
      "args": {
        "1": "stq",
        "2": "gem-pro",
        "3": "ine-pro",
        "inh": "2"
      },
      "expansion": "",
      "name": "dercat"
    },
    {
      "args": {
        "1": "stq",
        "2": "ofs",
        "3": "jē"
      },
      "expansion": "Old Frisian jē",
      "name": "inh"
    },
    {
      "args": {
        "1": "stq",
        "2": "gmw-pro",
        "3": "*jā"
      },
      "expansion": "Proto-West Germanic *jā",
      "name": "inh"
    },
    {
      "args": {
        "1": "fy",
        "2": "ja"
      },
      "expansion": "West Frisian ja",
      "name": "cog"
    },
    {
      "args": {
        "1": "de",
        "2": "ja"
      },
      "expansion": "German ja",
      "name": "cog"
    },
    {
      "args": {
        "1": "stq",
        "2": "jee",
        "3": "je"
      },
      "expansion": "Doublet of jee and je",
      "name": "doublet"
    }
  ],
  "etymology_text": "From Old Frisian jē, from Proto-West Germanic *jā. Cognates include West Frisian ja and German ja. Doublet of jee and je.",
  "head_templates": [
    {
      "args": {
        "1": "stq",
        "2": "interjection"
      },
      "expansion": "jä",
      "name": "head"
    }
  ],
  "hyphenation": [
    "jä"
  ],
  "lang": "Saterland Frisian",
  "lang_code": "stq",
  "pos": "intj",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Saterland Frisian entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "english": "OK, but I still don't believe you.",
          "text": "Jä, man iek leeuwe die daach nit.",
          "type": "example"
        }
      ],
      "glosses": [
        "Used to introduce a statement that may be contrary to expectations; OK; well"
      ],
      "id": "en-jä-stq-intj-93ghHU8m",
      "links": [
        [
          "OK",
          "OK"
        ],
        [
          "well",
          "well"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/jɛː/"
    },
    {
      "rhymes": "-ɛː"
    }
  ],
  "word": "jä"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "stq",
        "2": "gem-pro",
        "3": "ine-pro",
        "inh": "2"
      },
      "expansion": "",
      "name": "dercat"
    },
    {
      "args": {
        "1": "stq",
        "2": "ofs",
        "3": "jē"
      },
      "expansion": "Old Frisian jē",
      "name": "inh"
    },
    {
      "args": {
        "1": "stq",
        "2": "gmw-pro",
        "3": "*jā"
      },
      "expansion": "Proto-West Germanic *jā",
      "name": "inh"
    },
    {
      "args": {
        "1": "fy",
        "2": "ja"
      },
      "expansion": "West Frisian ja",
      "name": "cog"
    },
    {
      "args": {
        "1": "de",
        "2": "ja"
      },
      "expansion": "German ja",
      "name": "cog"
    },
    {
      "args": {
        "1": "stq",
        "2": "jee",
        "3": "je"
      },
      "expansion": "Doublet of jee and je",
      "name": "doublet"
    }
  ],
  "etymology_text": "From Old Frisian jē, from Proto-West Germanic *jā. Cognates include West Frisian ja and German ja. Doublet of jee and je.",
  "head_templates": [
    {
      "args": {
        "1": "stq",
        "2": "interjection"
      },
      "expansion": "jä",
      "name": "head"
    }
  ],
  "hyphenation": [
    "jä"
  ],
  "lang": "Saterland Frisian",
  "lang_code": "stq",
  "pos": "intj",
  "senses": [
    {
      "categories": [
        "Rhymes:Saterland Frisian/ɛː",
        "Rhymes:Saterland Frisian/ɛː/1 syllable",
        "Saterland Frisian doublets",
        "Saterland Frisian entries with incorrect language header",
        "Saterland Frisian interjections",
        "Saterland Frisian lemmas",
        "Saterland Frisian terms derived from Old Frisian",
        "Saterland Frisian terms derived from Proto-Germanic",
        "Saterland Frisian terms derived from Proto-Indo-European",
        "Saterland Frisian terms derived from Proto-West Germanic",
        "Saterland Frisian terms inherited from Old Frisian",
        "Saterland Frisian terms inherited from Proto-Germanic",
        "Saterland Frisian terms inherited from Proto-Indo-European",
        "Saterland Frisian terms inherited from Proto-West Germanic",
        "Saterland Frisian terms with IPA pronunciation",
        "Saterland Frisian terms with usage examples"
      ],
      "examples": [
        {
          "english": "OK, but I still don't believe you.",
          "text": "Jä, man iek leeuwe die daach nit.",
          "type": "example"
        }
      ],
      "glosses": [
        "Used to introduce a statement that may be contrary to expectations; OK; well"
      ],
      "links": [
        [
          "OK",
          "OK"
        ],
        [
          "well",
          "well"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/jɛː/"
    },
    {
      "rhymes": "-ɛː"
    }
  ],
  "word": "jä"
}