Editor in Form contentHTML

I have an Editor inside a form, and I want to initialize it using an external file.

If the Editor was outside the form, I would use contentHTML to point to the source file.
Is there a way to do this when the Editor is in a form?

thanks

You may use the getEditor|() method and apply the the dhtmlxEditor API to the returning object:
https://docs.dhtmlx.com/api__dhtmlxform_geteditor.html