Android's Linux Terminal app is Debian, how can I add DietPi to this

So If you enable Developer Mode on the Google Pixel March 2025 update, a Native Terminal app appears which pulls down a 500MB Debian Virtual Machine that runs on your Google Pixel.

Which is great, but if I wanted to run DietPi on this, how can I convert it?

Generally via this description: Supported hardware - DietPi.com Docs

Give it a try (but I assume this will fail on your device).
If it should be convertable: Can you power down and power up this status afterwards? Or is the installation status on its initial state if you power up the Debian again?

arm64, you get given a user droid with sudo rights.
running script.
if you disable Terminal it wipes the virtual machine