If you give all your units to AI General, you don't even need to worry about this. This is only helpful if you want to differentiate between transformed units and summoned units.

AI General can only identify transformed units if it knows to look for them. The only thing that these submods do is to say, "If AI General 3 is enabled, tell AI General 3 that some Original_Unit_1 might have an ability to transform into some Awesome_Unit_2." (AI General 3 already comes with the necessary script for vanilla transformations.)

(None that I know of so far.)

• Submod for 龙裔增加化龙诀
  
• Submod for Avatars, Pretenders & Blessed (Kislev & Greasus)

Other modders that add transformations can use these scripts as example templates. Just change the unit and ability keys to match your own. Comments are in the script. Feel free to ask if you have questions.