How to pass custom argument to authorization polic

I need a custom attribute for my rest API in asp.net core MVC. I want to add this attribute optionally to some of my APIs. This attribute checks if the API is accessible to user or not based on some condition and throws a 403 if it's not accessible. I was using filters to achieve this and the issue with filter is that filter code gets executed whether the attribute is added or not to my API. I would want that my filter code is executed only when this attribute is added to the API.
My colleague suggested that I should be using authorization policy instead of filters for this use case. Policies are executed only when it's added to the API. Also since I am throwing 403, authorization policy is a better candidate. I explored authorization policy but my issue is I am unable to pass custom attributes to Authorization policy.

For example, I was able to do this using filters and custom attributes.

[MyCustomFeature("param1", "param2")]

How can I do the same in authorization policy? I am using this example for authorization policy. Custom Authorization attribute asp.net core

See here. Strongly recommend reading top to bottom.

The summary is that, regardless of how you tap in to the policy-basd auth system, a policy is always resolved via a single string. So, to get what you want, you need to:

Implement a custom attribute that subclasses AuthorizeAttribute and that takes the arguments you pass in and uses them to generate a policy name string. Read the "Custom Authorization attributes" example in the linked docs page closely, see how it actually stores the value of "Age" in the Policy string.
Implement and register a custom IAuthorizationPolicyProvider that can interpret the strings generated by your custom attribute and generate the appropriate policy on the fly.

There's not a ton of code involved and it's not super complex, but it's a little strange/awkward that it comes down to putting stuff into a string.