Terento for third party map management on Apple Silicon, is perfect - https://github.com/VooZ2/terento
"Connect your watch, choose a map, and let Terento handle the download, installation, and transfer checks from your Mac.
Terento is free and open source, built for Apple Silicon Macs and Garmin smartwatches with map support. Choose from Freizeitkarte, OpenTopoMap, MapRando, and BBBike, or import your own compatible .img map."
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On Reddit - https://www.reddit.com/r/GarminWatches/comments/1wd7doe/terento_beta11_is_out_now_with_maprando_support/
Do not hesitate to go on Reddit and Vote/Comment MrDonas (u/MrDonas)
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This article is interesting for OpenMTP if necessary - https://www.nakan.ch/wp/2024/08/30/acceder-a-la-memoire-de-sa-montre-garmin-sur-un-mac-edition-2024/