I've been using Windows Terminal since the source code was released, and now that we have support for split panes, I wanted a way to easily create a tab with three panes (one for each version of PowerShell I want to test against).
Unfortunately, there's no support for opening tabs from the command-line yet, nor is there any support yet for specifying which profile to use in a new split terminal. There are open issues for those features, but although I've done a PR or two for it, I didn't think it would be an easy thing to pull together, but I knew that new tabs use the default profile.
Switching the default profile and then creating a new split with the hotkeys works great,