Append query parameter to a page link?

Really hope I’m missing something simple.

I have a button. It links to a page.
image

I simply want to append a query string to the end of it. ?key=value

Simple problem. Hope I’m missing a simple solution?

Cheers!
Al

Well, this is a pretty lame solution but the only one I could come up with is to turn them into External links and manually add them as /page-name?key=value

Will be a bummer if I ever rename pages down the road.