Well heck, then, let me give it a shot and answer the direct question you asked about if you need Pro. I suspected not since Pro is the same OS you're using before you unlock it's few extra features.
Sure enough, from https://www.xda-developers.com/how-to-install-w...
"You don't need a mega-powerful PC to run WSL 2 nor do you need the "Pro" version of Windows as you traditionally do to use the Hyper-V VM tool. WSL 2 does utilize the Hyper-V architecture but you don't need to pay extra for it. WSL 2 also supports both x64 and ARM processors. If you're using it on an ARM-based machine, however, you will need to use a version of Linux that has an ARM release, such as Ubuntu.
WSL 2 can also be run on Windows inside a virtual machine as long as the VM software you use has support for nested virtualization and this is enabled."
More here:
https://learn.microsoft.com/en-us/windows/wsl/faq
https://www.sitepoint.com/wsl2/
I hope it helps.
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