If I recall correctly, they only work in PowerShell 7. If you don’t even have them in there, you can install them from https://github.com/microsoft/winget-cli (which is bad UX, but if you just need them on one system it’s a way to do it).
I'm in PowerShell 7.4.2 and they're definitely absent. I hadn't thought to install directly from GitHub, given part of the whole shtick of winget is it's The One True Package Manager and bundled, but I can't say I'm surprised, either...
