Using jwt with jitsi docker

I have my docker jitsi set up and it’s all working good, but I want to be able to create conference calls between 2 or more people using another web app that I have, so after searching abit I found this

Which seems to work well but I’m confused about what goes in the jwt field, could someone provide me with an explanation? How do I make that jwt token from my app in that jwt field and send it to the server so that my web app is able to create rooms and let people join in?