If the torn edges will come together over all or most of the tear, you could try patching outside and in with good quality duct tape or similar tapes designed for fabric repair. I have done this on exactly the same type of awning which suffered from mouse chewing when off the van and in a loft.
Gorilla tape comes in black and other colours, also clear.
I used Fibrefix tape which claimed to be '100 times stronger than duct tape' and it lasted several years until I disposed of the awning.