How to use a custom label for a field using schema.json?

I need to use a custom label for Content Type field. I have added field as below in schema.json
“projectName”: {
“type”: “string”,
“required”: true,
“unique”: true,
“label”: “Project Name”
}
But label is not getting updated.
I saw some posts suggesting to update via Content Type UI, but I would like to update vai JSON. Could anyone share your thoughts?

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