We bought a screen room that attaches to the awning, from Jayco when we ordered the camper new. It was made by Jayco and fits nicely.
We have a 2011 Jayco 1208 that we custom ordered. When we took delivery of our camper, the screen room and awning were not there, but were being mailed from Jayco. Easy to install and nice to have.
They may have one to fit your awning already. Just need to call them and order it.