Product structured data – can set "point" instead of price?

My site owns a customer loyalty program in which a member can reward points while they do some actions. They can spend their point to buy stuff. How to set the markup for the case that the product is only paid by point in the meanwhile no pricing? what's more, the product is paid in dollars plus points? Now, it shows that the product is free, but it was not the case. It costs 2,500 points.

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