More details on this topic can be found in our online documentation: Adjust ask-at-runtime dialog
If a Profile in pdfToolbox contains variables, the ask-at-runtime dialog appears before execution to let you enter values. By default, it shows all variables—but in some cases, you may want to hide or disable certain ones based on specific conditions. This video shows you how to customize the ask-at-runtime dialog using a bit of JavaScript to control the visibility and behavior of variables.
I would like to see the possibility to also change the header of the Ask-at-runtime-dialog to get a more descriptive message about just this dialog and what it can do.
Maybe a header field where we can add text, of course with the option of variables 
Hi Jan,
You could use already the way to adjust the used HTML template as described here:
All Variables (no matter if used in the UI or not) are listed in the 8_loadDefault.json or
10_loadProvided.json, which are available during runtime. You could just put your additional details into a separate Variable and use the content in the UI.
Best,
Marc