Long-running UXP script: is there any way to show progress and let the user cancel?

InDesign 2026. I have UXP scripts that can run for a long time - walking every story in a
large document, adding many pages, and so on. I would like to (a) show the user that work is
in progress, and (b) let them stop it partway through.

I cannot find a way to do either, and I would like to know whether I am missing something or
whether this genuinely is not available in UXP.