I am an Amy Johnston fan. I asked her on Twitter if she would consider auditioning to play Black Canary in the upcoming Birds of Prey film and she said this...
Amy Johnston is mostly known as a stunt woman. She did most of Scarlett Johansson's stunts and fight scenes for Black Widow in Captain America: Winter Soldier. But Amy Johnston fans knows she is more than just a stunt woman. She is actual a decent and improving actress. She played a very well acted Harley Quinn in a video from Batinthesun, on YouTube. One of her first feature film playing the lead role is a film called Lady BloodFight.
A decent action movie where she did a great job taking on a lead role for the first time. Her performance in a short film called, 'The Gate', also shows that Amy has great potential in acting.
If you think she still lacks acting experience, just take a look at Gal Gadot. None of her roles before really got anyone paying attention. She never really had enough good acting experience to take on such a massive world wide role like Wonder Woman. But she proved us wrong. It all depends on how much effort everyone puts into the movie, not just the acting. I think there is no other actress more deserving for this role. Amy is perfect for the role.