There are prescription inserts for it, including astigmatism and dioptries

Like Apple's? Single source and overpriced?

They list three different vendors on the site for prescription inserts (one per region), and there are other vendors who offer them, too. The partnered US vendor had them listed at $150 but I think some of the other options are cheaper.

I'm in the EU, I used HONSVR and paid $50, which seems reasonable.

using honsvr lenses with xreal now for a mild astigmatism and they're great.