Make a shortcut (iPhone) that will send a page via

I am struggling to figure out how to make a shortcut (apple shortcuts app) that would use previously entered number into the "To" filed and the previously entered message in the "Your message" field in the website. This is not really a keyboard maestro question, as it would be easily accomplished with just "click tab key".

I believe that the solution will likely require a JavaScript to accomplish (which I can run on Shortcuts app). I looked at JavaScript sites and still cannot figure it out. I always had a fantastic luck in this forum, thus decided to post this question.

Thank you,