How can I fill "Area on Document" using a workflow?

A form is required for this.

This form must meet the following conditions:
- The form must be a formular template
- The form must be a fillable form
- The form must have fillable areas

Furthermore, the form must be entered in the start conditions of the workflow.
If all of the above conditions apply, insert areas can be filled on the document.

Rights of the individual users:
The user who is to fill the document must be allowed to edit the document.