FYI
you do not need the if - then for it to evaluate
Also the LIKE operator is usually used with a ? and/or * to look for items that are partial matches verses the IN which is a full match
if you want to keep your curretn syntax itr would be
if ({OBJECTS.OBJECTTYPE}) like ["LEVEL","FIRE","LOCAL"] then true else false
These both do the same thing though
({OBJECTS.OBJECTTYPE}) like ["LEVEL","FIRE","LOCAL"]
or
({OBJECTS.OBJECTTYPE}) IN ["LEVEL","FIRE","LOCAL"]