Redirect to specific origin with load balancing?

I've been reading the documentation for load balancing because it's a service I'm considering purchasing in the near future for a project, I'd be interested in Geo steering for pools and Random steering for origins. However, I would also like to provide the option for a user to send their request to a specific origin, ideally through something like a request header or a query string, bypassing load balancing. Would it be possible to do this through configuring load balancing or would I have to make that user use a different URL for their request, and use subdomains for different origins or something?
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