I recall trying this a year-ish ago. Used the default A10A. As with most thing DCS/AI it takes some messin with - the “inner-workings and hidden movements” are not, as far as I can tell, public knowledge. The ED Mission Editor forum is a place to find stuff too.
If I recall I actually got it to mark with smoke rockets. I think. Not sure I have that miz still but I’ll look see.
Glad you got it sorted. I meant for an AI to serve as AFAC I used the A10A in the mission editor. I thought that was included with the game but it’s been so long.