Yes it's canon, Velma is outright stated to have a crush on Coco Diablo, the designer of all the monster suits bad guys use to commit crime, and Coco flirts back. And Daphne plays wingman, it's cute.
I like that Suletta has a beam saber, her uniform is designed to resemble the uniform of the Holder, and of course Miorine's dress is based off of her normal school uniform.