Trigger workflow from input click

I want to create a workflow like the facebook comment feature. Basically when someone clicks on the input to type in the comment it automatically triggers a pop up where they can put in their comment. Right now I’m not seeing the ability to add a workflow to a multiline input.

If the user is not going to use the multiline input that he sees in the frontend, instead a popup is going to appear, then don´t use a multiline input at all, just a group with a text like it is a multiline input then you activate the workflow on click

For some reasons best known to you, if you wanna stick to what u want… You can just use the workflow “when an input changes” the your reference elements and give workflow actions to show the pop up…