Creating hover mask on image in Plasmic.

Hi Everyone, my name is Sebastian and I am working on my first website in Plasmic. I was wondering, if anyone knows how can I create a mouse-over shape mask on a picture. We want classic square blog post pictures, but the mouse Hoover effect should put a shape mask on selected posts. Please see the example here:[…]5-70&viewport=-85%2C-207%2C0.19&scaling=scale-down&mode=design

Thanks for any tips!