How to reverse proxy from a domain to a worker?

Hello, is that possible to create a reverse proxy with a connection DNS record?

For example, I have a domain myapp.com and need to add a worker and route the worker to subdomain proxy.myapp.com. when I route the worker to proxy.myapp.com it’s working.
But I have a problem when I am adding DNS record CNAME in another domain, it’s not working, it doesn’t point me to the worker, cause it points proxy.myapp.com to A record.

For example what I would like to solve:
app.domain1.com CNAME proxy.myapp.com → the worker
app.domain2.com CNAME proxy.myapp.com → the worker
app.domain3.com CNAME proxy.myapp.com → the worker
etc.

it’s not working cause it points me to A record:
app.domain1.com CNAME proxy.myapp.comA record of proxy.myapp.com.

How is it possible to solve or is it possible?

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