Does this work from a fork? That is, can I file a stacked PR to a project not owned by me, by creating branches in my forked project? Previously I asked AI about how to contribute stacked PR, it told me that I can only do it when I have push privileges to the repo, not from a fork, and the doc here is ambiguous.

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OK, I found this from official docs, so this feature is now quite useless to me:

> Can stacks be created across forks?

> No, Stacked PRs currently require all branches to be in the same repository. Cross-fork stacks are not supported.