bind launch-context(timezone,locale) with proxy

Dear all, I have bunch of proxies. Cloudflare and many other anti-bot protections check for the ip address and the timezone. I could see that because of this discripency my crawler is being detected as bot. How can I bind this launch context which has correct timezone and locale to a proxy+ browser ?

I have seen proxy configuration but how can I tell the browser being launched to use a specific context ?

Thanks in advance.