Use rate limits when accessing external services

I would like to limit the number of requests to external services per minute.
So far I could only configure limits for internal services. That’s nice, but I need limits on external services. At various points, an internal proxy (like tinyproxy) with an istio-sidecar was pointed out. Can someone support me with the appropriate configuration. Basically access to (https / http), max 10 req / sec.

that would be great

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