Extract specific data

Good evening, I have a json file and I would like to know if it is possible to extract specific data from this code:
example

“content”: {
“type”: “text”,
“$t”: “pseudo: 5, roger: 1, pierre: 1, jane: 1, kevin: 1, robert: 1”
},

Is it possible to extract the first names?

Cordially.

This discussion board is for the JSON API format (https://jsonapi.org/), not for JSON in general.