Add interactable long text object in COOIS.

Hello I am currently Implementing a BADi on TCODE: COOIS

and I was wondering if anyone knows if what I am trying to do is even possible and if yes what are the steps needed to be taken to do so.

I have added the field currently only called "TEXT" to COOIS via adding some fields to CL_IOHEADER
I would like to individually save a text with FM SAVE_TEXT into a SO10 Object I created. The problem is I somehow want to make it possible for the end user to add/edit this text by clicking on the field.

Any idea how if all this is possible?