One of PSADT’s Developers has created a WinGet PowerShell module for PSADT V4
GitHub for Source and how-to compile instructions (currently at rc3)
PSGallery for compiled version (currently at rc2)
He has posted about it in the Extensions section
I’m hoping this is intended be used for both providing a WinGet function for PSADT and for showing how PSADT v4 extensions are done.