Although this doesnāt answer your question directly, if your internal host has a domain name in externally visible DNS (eg āsomething.comā, āsomething.ioā, etc), then you could potentially generate a valid Lets Encrypt certificate for it using DNS based authentication.
Thatās how itās commonly done for servers which arenāt reachable from the outside world.
Can give you the exact certbot commands to run for generating the certificate, if thatād be useful. (?)
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