Nice project. I'm a heavy jq user and still find myself regularly tinkering around with queries on https://jqplay.org. It would be nice if there were a similar page for jql, even if it is just a local server.
I was thinking of an interactive terminal app, but that would be much more work.
Though you can surely put a oneliner together which achieves the same effect using fzf, as per: https://paweldu.dev/posts/fzf-live-repl/
Here's an interactive implementation (in Emacs): https://github.com/200ok-ch/counsel-jq