External domains to subdomains

I have a domain: “mysite.com”, and I have subdomains:
app1.mysite.com
app2.mysite.com
app3.mysite.com

Using Cloudflare, is there a way to access these subdomains through external domains? For example, when I access:

site1.com - I want to display the content from app1.mysite.com
othersite.net - I want to display the content from app2.mysite.com
anysite.com - I want to display the content from app3.mysite.com

However, I don’t want it to be a redirection; I want it to be a direct mapping without changing the URL in the browser.

Thanks

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