How to work with JIRA REST API issue field of type "array"

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Dear Colleagues,

I’m trying to make a small configurator to filter the values, which can be put into Jira issue field of type “array”. I faced a problem, the actual array variable of the different fields can be “values” or “labels” or something else, depending on the field. Is there any possibility of figuring out what variable name contains the exact array of values of the field? For example, I have a field:

{
    "required": false,
    "schema": {
        "type": "array",
        "items": "string",
        "system": "labels"
    },
    "name": "Labels",
    "key": "labels",
    "autoCompleteUrl": "https://api.atlassian.com/ex/jira/b1147259-6ab6-43b0-ba8e-4395dedef569/rest/api/1.0/labels/suggest?query=",
    "hasDefaultValue": false,
    "operations": [
        "add",
        "set",
        "remove"
    ],
    "fieldId": "labels"
},

and I need to know, if the actual values of this array will be under “labels”: [ “label1”, “label2”, “label3” ]. What API call can tell me, that for this issue field of type “array”, I can access the array values using “labels”?
I appreciate any help you can provide.