I need a dry CURL command for enable (and later for disable) on the fly a nat rule preconfigured.
Its need for open port 80 just for the necessary time for finalize a letsencrypt renew challenge and disable just after.
Can someone help me? Thanks in advance for your kind support.

You can create a Jump rule into a specific set of dst-nat rules from the dstname ruleset.
You will need to find it first so a commend might be a good way to find the jump rule.

The issue is from `curl`, it needs to find the item. That requires using .query syntax in the REST API, see here for some examples: viewtopic.php?t=204028&hilit=query