Gentoo released a new aarch64 stage3 tarball for Android last month. However, according to the official wiki, a rooted device is needed for the installation.
For those non-rooted devices, one solution is to use PRoot to simulate a rooted environment.
Termux is an Android terminal emulator and Linux environment app that works directly with no rooting or setup required.
Cloudflare Workers provides a serverless execution environment that allows you to create entirely new applications or augment existing ones without configuring or maintaining infrastructure.