I work on Deno, specifically the CLI. We support both Mac and Linux ARM, though the Linux ARM builds are currently produced by a third party contributor.
If you have specific issues with ARM, I'm certainly interested in fixing those. I don't have any timeline for when we'll add Linux ARM as a binary release target but I'm happy to ensure any ARM-only bugs get the proper attention.
I haven't specifically tested it but it _should_ be supported. I don't have easy access to graviton instances at this moment, but I've previously used https://github.com/LukeChannings/deno-arm64 with great success.
As long as your ARM OS is 64-bit, Deno should function properly. 32-bit _might_ be supported, but TBH we don't do any testing of those configurations as far as I'm aware.