Can gramps-project/flatpak be made a fork of flathub/org.gramps_project.Gramps?

[OzarkShepherd]

https://github.com/flathub/org.gramps_project.Gramps is the repository that flathub uses for Gramps. Right now I push changes to here, gramps-project/flatpak, first for review. Then after a while has passed, I copy and paste the changes to flathub/org.gramps_project.Gramps so that the Gramps flatpak can be updated on flathub. Would there be a way to make here, gramps-project/flatpak, a fork or something of flathub/org.gramps_project.Gramps? (I don't know how to do this.) That way not only would it be easier to push changes to the flathub repository from Gramps, but also if something happens to me, then a way would already exist for someone else from gramps-project to take over maintenance of the flathub repository for Gramps.