To build on @DibsyJr's answer, I've created an attribute that I attach on the controller/method that I want to block, and check it in the OnCheckSlidingExpiration event handler. I find that more flexible than just checking the path property.

[AttributeUsage(AttributeTargets.Class | AttributeTargets.Method)]
public class DoNotRenewAuthCookieAttribute : Attribute;

options.Events.OnCheckSlidingExpiration = context =>
{
    if (context.HttpContext.GetEndpoint()?.Metadata.Any(e => e is DoNotRenewAuthCookieAttribute) ?? false)
    {
        context.ShouldRenew = false;
    }

    return Task.CompletedTask;
};