It looks like we don’t have support in the node for adding a contact to a list which is a bit odd, The only thing I can think of would be to use the HTTP Request node and send the API call that SendInBlue needs for an automation or list update.
Something like the below would add a user to a list using their email address as an ID but you can also use an ID instead if you have it.
The JSON you are sending is not correct, It needs to be something like {"emails":["[email protected]"]} for IDs it would be {"ids":[10]} so with an expression maybe something like…
That looks to be ok, I have just been playing a bit more I think the issue is oddly down to the option being a number. This only seems to be an issue when when coming from a node by name rather than $json,
Then I tried to insert the actual query URL in Input 2, the one I get from the path Current Node > Input Data > JSON > query, but still I get this new error: