Protect firebase function against request flooding (rate limiting)

I have a HTTPS Firebase function (in the form of which has to be publicly accessible to anyone. From what I’ve read, these functions are not protected against abuse, so I guess someone could continuously send requests to the function, causing some big costs.
Can I use some Cloudflare product to proxy the traffic through Cloudflare, thus implementing some degree of protection? I’ve got a domain (let’s call it mydomain) which I hope can help me with this. I’m thinking of something like this:
User accesses → The traffic is proxied to my function’s endpoint by Cloudflare, without exposing the firebase function url to the user. Could you give some insight into where to start?

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