My workflow: I have a fork (origin) of a remote project (upstream). I have created a branch, topic/TICKET. I want to create a pull request of my origin branch to the upstrea
I don't think you can do that on Github. And also think is okay like that, because you shouldn't be able to "create" a new branch on a project you don't necessarily have push access.
Even if you do have push access to the upstream project i don't see it as a clean workflow.