How to run edge inside MSIX

Edge also runs in a container, but in that scenario is in a separate container.  If it needs to see files in the package, you should try shared package container (Win11 minimum requirement).  You'll have to read up on that, but basically you are creating a separate xml file for the package definitions, and use a separate PowerShell command to deploy and activate the xml file.  When your app starts, edge should then start in your container.