How to prevent subdomains from being accessed by certain countries

How to prevent subdomains from being accessed by certain countries?
E.g:
abc.com can be accessed by China.
However, aaa.abc.com does not want to be visited by China.
Is it feasible?
How to set in cloudflare?

Blocking firewall rule.

(http.host eq "aaa.abc.com" and ip.geoip.country eq "CN")
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