create jwt takes no params?

i mean it should store data right like name and email so shouldnt we be able to add other data like maybe nickname

TL;DR

Title: JWT creation without params; Can't fetch and add additional data like name or email. Unfortunately, creating a JWT without params is not possible. The JWT only contains the userId, $id, and $createdAt. You cannot access the JWT_SECRET or add additional data like name or email.

no you are accually not able to do it, you cant even know JWT_SECRET

in JWT is only userId of user and $id and $createdAt

ok so now imagine i log in using create email session and as jwt takes no params im assuming there is some way that it fetches the email id and returns the userid am i correct?