See question ‘Text on form, the first time you open it’.
The idea is to be able to add an custom id to a form (e.g. ‘PR1’) and use it in a microflow (‘Get form custom id’-action).
In this way 1 microflow can be used on all forms to render a form-specific text without creating a microflow per form that uses the same sub-microflow with a different parameter.
If the custom id on the form does not exist, pass empty value to the microflow.