Generally, the poker personnel are separate from the casino floor personnel. Separate departments as well. Only in extreme circumstances would there be any crossover.
As a poker dealer, you need to know No Limit inside out. And by that I mean knowing the rules, knowing when a floor person needs to be called (even if you know the rule!), and stupid tricky stuff such as remembering where the button is, cutting side pots and knowing who is in which pot.
Once you have those skills, add PLO, which requires keeping a running total of the pot size in your head, ready to respond when someone raises "pot".
On the casino floor, you need to know craps, or BJ plus at least one other game to even be considered for a job. Once hired, you can learn additional games, although often craps dealers end up doing nothing but craps and other dealers deal everything except craps. It's fine to not know craps, however, knowing craps may be an advantage when getting hired.
For your situation, don't even think of trying to learn craps to get that advantage I speak of. And if all you know is poker and BJ, go for the poker job, and discuss the possibility of eventually working the casino floor.
Good luck!