you get them by switching to a different key and then entering iv♯7 or i♯7, and then switching back to your desired key (using the relative option). Can take a bit of trial and error.
For example, to get a vi♯7 in F Major, you’d switch to A Phrygian (the relative Phrygian), enter iv♯7 , and then switch back to the relative major (which of course is F major).