Can I configure DDNS on OpenWrt for one hop forward

I have a ISP modem that does not have DDNS feature. Is it possible to somehow configure OpenWRT (preferr FreeDNS) so that it gives me the real external IP address rather than just the 192.168.x.x of the ISP modem? (I can't search for this because I don't know what you'd even call it.)

Shouldn't it already?

AFAIK it does a whats my IP kind of query, and updates, if needed.

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It is possible.
Navigate to Advanced Settings and set IP address source to "URL".
You can see the list of the URLs that you can use in the docs:

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