Right, I'm sorry if I wasn't clear --- when I said "run in Chrome" I meant "in the Chrome browser regardless of OS, e.g. in Linux"
I want the kiddo to have not a Chromebook, but real Linux, e.g. Ubuntu. While the Android apps work fine, other things we do (e.g. easily saving files, dealing with local network stuff like Java Minecraft play) do not.
There is Waydroid. It doesn't use Chrome but should work on any Linux distro. I have used it in the past with some success, but not for quite some time now.