In #39132 (comment) I was advised to use my own picker in place of showWorkspaceFolderPick so that I could customise which folders appear. I'm now trying to do that but found that it only takes in a string[] so you can't achieve the same UI as the built-in one which puts the leaf folder name first:

It would be great if we could provide it some custom object with some properties for labels and then get the whole object back on selection (eg. so we don't have to look a complex object back up from the returned string).