How use Jwt IFRAME API

Hello, can you tell me how to implement the token in iframe api?
this is how it is in the documentation but I can’t understand it very well
I want to implement it locally

To pass a JWT token to Jitsi Meet use the following:

const options = {
   ...
   jwt: '<jwt_token>',
   ...
};
const api = new JitsiMeetExternalAPI(domain, options);