Hi!
The first type of OVL file you are refferring to is probably too generic / broad for creating a proper definition for TrID.
The second type, instead, maybe a very good candidate.
If you have some of that RTC OVL files at hand, you may try to create a new def using
TrIDScan. If you then send the XML file to me, I will check it and add to the public db.
Thanks,
Bye!