Override Users Modal (Angular LeptonX Theme)

[joao-pedro-de-oliveira-souza]

Hi guys,
I'm trying to add a new tab inside the users modal to manage a table that links a user with another table. I found some ways to override the entire page, but I couldn’t even find the source code for the users page.

Is there a way to override just the modal, or ideally extend it to include the new tab without replacing all of its content?
If you could share the source code for the users page/modal, that would already help a lot.