How a 'select' field can be assigned to a custom value not in the 'options' array?

I’m developing a Custom App that requires that one ‘select’ type field can be assigned to a custom value provided by the user if the provided ‘options’ does not satisfy user needs. I tried with ‘validate’: false, but it didn’t work.

Current field definition:
{
“name”: “voice”,
“label”: “Voice”,
“type”: “select”,
“help”: “Select the voice for your voice-over. More voices available here.”,
“options”: [
{
“label”: “Libby (English UK)”,
“value”: “en-GB-LibbyNeural”
},
{
“label”: “Elliot (English UK)”,
“value”: “en-GB-ElliotNeural”
},
{
“label”: “Ryan (English US)”,
“value”: “en-US-RyanMultilingualNeural”
},
{
“label”: “Ava (English US)”,
“value”: “en-US-AvaMultilingualNeural”
},
{
“label”: “Tony (English US)”,
“value”: “en-US-TonyNeural”
},
{
“label”: “Davis (English US)”,
“value”: “en-US-DavisNeural”
},
{
“label”: “Jane (English US)”,
“value”: “en-US-JaneNeural”
},
{
“label”: “Arnau (Spanish Spain)”,
“value”: “es-ES-ArnauNeural”
},
{
“label”: “Arabella (Spanish Spain)”,
“value”: “es-ES-ArabellaMultilingualNeural”
},
{
“label”: “Fabio (Brazilian Portuguese)”,
“value”: “pt-BR-FabioNeural”
}
],
“required”: true,
“default”: “en-GB-LibbyNeural”,
“validate”: false
}

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