Query regarding auto merge

[Divya-Haridasula]

I have a query regarding "auto merge to all higher hierarchy branches".
My Repository's branch structure is like this, release1(current release) -> release2 -> develop. If I merge a PR to release1, my expectation from Github is that it should auto merge the same PR to its higher hierarchy level branchs i.e., release2 and develop.
Is that possible? I could not find any help pointing to this exact issue in Github docs.