Look for a file called descr_win_conditions.txt (in the mod's folder, if it has one). It's pretty self-explanatory. Assuming XGM installs into its own folder it'll be in XGM\data\world\maps\campaign\barbarian_invasion or imperial_campaign
You can either do something like this (verify region name in descr_regions.txt):
or like what vanilla has:Code:hold_regions Latium take_regions 50
Code:take_rome take_regions 50
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