230v GFCI spa with 115v spur
Yeah, this is just a 4-space NEMA 3R breaker panel with a GFCI breaker fitted for you
There really isn't much special about &quot;spa panels&quot; like yours; they're just small, outdoor rated, main lug breaker boxes with a GFCI breaker already fitted in them. So, you could fit a 15A breaker (or even a 15A GFCI breaker, as your panel is a Midwest Electric unit, which means it accepts GE THQL breakers) in one of the spare slots and run your outdoor socket(s) off of that, or even have two outdoor socket circuits on two separate 15A breakers!  And since the hot tub's on its own breaker in the spa panel, none of what you do with the extra slots will impact it provided you don't overload the feeder itself.