It's just a flexibility thing, not a cis women thing. A lot of having a more pronounced arch in this position will come down to thoracic extension mobility more than anything else. Depending on the shape of your hips you might find it easier to arch with your knees closer or further apart. Yoga will def help. Most of the way you can train thoracic extension is actually through rotation rather than trying to extend like this, because of the way the spine is shaped basically.