Ignoring Failed Schema Properties

Is there a way to sort of strip away/ignore properties that make a schema fail? I have a field that has +- 20 variants, I'm only interested in a couple of those, so I wrote just two schemas for them and one for their union. If the field is one of the unsupported ones the parsing is going to fail, but it's fine, I don't really care about that field in such case. What should I do?
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