If you can get to the back of it you can add some repair tape for reinforcement, and then use a color-match vinyl patch kit to patch the front.
If you can't get to the back of it, then just about any DIY repair is going to be a hack with an indeterminate lifespan. I've done a lot of vinyl repairs, wouldn't consider myself an expert, but the cheap products all tend to have tradeoffs and the issues come back after a season or two.
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