I don’t know if it is relevant, and I hope I’m not off-topic, but I tried to cross-compile for a Raspberry Pi a while ago (it has this architecture), and I remember finding myself in murky waters. Here is the link of the thread if you’re interested: Using stack on Raspberry Pi - #8 by cloudyhug
At that time I had to compile on another machine as stack was not working on the M1 architecture. Now it does when installing through ghcup, which is great, but I don’t know about the status of cross-compiling for Linux aarch64.
Good luck!