Map a subdomain to a subfolder

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For the records: I got it working with this config:

foo.domain.tld {
	handle {
		rewrite /* /foo{uri}
		reverse_proxy * http://IP {
			header_up Host {host}
			header_up X-Real-IP {remote_host}
		}
	}
}

From my understanding what it does: When a user hits https://foo.domain.tld the block appends foo and reverse proxy that to the IP, so as a result the request gets transformed into http://IP/foo.

Thanks for your answers, which lead eventually to a working solution.