How to repair rooftop tent roof that is damaged?

[Camping USA]

We bought a used Torro Offroad hard shell tent and the roof had a hole in it, I tried reaching out to the company to check with them and turns out this company is out of business! @#$@#%!!! There goes the hope of getting parts for this thing out the window! So the roof is made from this plastic shell, how would you fix or fill a 3/4" hole?