Flau’jae Johnson is finding her voice. That may sound contrarian, considering the 22-year-old rookie is also an ascending rapper signed to Jay-Z’s Roc Nation label. Johnson — who was drafted eighth overall by Golden State, then traded to the Storm — has 266,000 subscribers on YouTube and 167,000 monthly listeners on Spotify. At 14, she performed original songs on “America’s Got Talent.” Her credentials include a national title and All-America honors as LSU’s electric shooting guard … plus tracks with Lil Wayne and Waka Flocka Flame. As Johnson declared on the recent track “Shoot 4 the Moon”: I’m not scared to chase none of my goals, I never see fear. I just had to open up my eyes, I start to see clear. But on Tuesday, as sneakers squeaked and instructions echoed during a practice scrimmage at Climate Pledge Arena, it was easier to see Johnson than to hear her.…