Yup, you are right... Currently it is not possible on Mac using Monogame while there are ways to do it over Windows... But Monogame team surely have been working over this since around 6 months and I'm sure they will develop something pretty soon... You can follow their discussion here
In the meantime, I would suggest you to try your hands over ManagedFXB if you are a non commercial identity... All the best then...