It seems you can’t add routes in between two filters. In my case I want a certain filter to be skipped for a few routes. Is there a way to do that? Only apply a Filter to a couple routes out of many?

Nope. You'll have to apply the filter individually, or wrap everything and come up with another way to discriminate. What was your use case?

Previously I had an auth filter that would return 401 unless the user passed a specific token. But then I realized there are a few endpoints (mostly health ones) that need to be accessible unathenticated. So I changed it so the auth endpoint now sets a boolean flag, and only checks it for the endpoints that actually do things.

Best thing here is to split the API into route block sections and then some filters to the ones you want protected