I need to display the user's project(s)

When I display the profile of a user, I have to display his professional experiences: those he added manually as well as those he was a member of the team on sib-app.

For now, when I take the JSON of a user, I can not find a relation between that user and the project in which he participated.

https://test-paris.happy-dev.fr/projects/1/ I can see who is taking part in. https://test-paris.happy-dev.fr/users/20/ User 20 seems to have no project.

Please, can you do something?