Same rule applies here but they have to make the HS roster. You're not making Varsity, JV or Frosh softball teams at the local HS here without a few years of competitive travel ball.
It varies from place to place. A majority of the JV team at my DD's HS have never played at all before, and there are only 4 TB players on the Varsity team. By contrast, one of my DD's TB teammates is on Frosh team of mostly TB players.