How do I use formtext where it is only in the url of a link and not in visible text. For example, if I want to send a tracking link where the tracking number is not visible, but only in the URL. I have tried the following and it just inserts the link with "{formtext: name=Trackingnumber}" literally as part of the link instead of popping up a form to ask me for the tracking number. If I have the "{formtext: name=Trackingnumber}" somewhere visible in the snippet, I can put "{=Trackingnumber}" in the link and it works fine.
{link: https://www.fedex.com/apps/fedextrack/?action=track&tracknumbers={formtext: name=Trackingnumber}}Track your package here.{endlink}