Unfortunately, I am not versed in linguistics, but I would suppose so, because its etymology [1] based on the words where it's derived from would mean "I am on something" in a literal or more metaphorical sense (could also be used as "I'm focused on something") and it's also widely used almost everyday in the "everyday's bread" way in our most common prayer (we used to sing that every morning at school) while also never being used in any other context except for my first post's phrase.

[1] https://el.wiktionary.org/wiki/%E1%BC%94%CF%80%CE%B5%CE%B9%C...