Using the API, can I include an update as I create an item?

Is it possible to include some update text when creating a new item via the API? I saw a related question involving a more complicated Python script with loops, etc. where the response was that it would be necessary to create the item first, capture the item ID, and then add the update. Is that always the case?

Related to my question, could the update string be included from a variable in JSON? How might that work?

Maybe do it in 2 requests?

Yes, that’s kind of what I figured. I’m hoping to automate this process, triggered from an event via Microsoft PowerAutomate M365, so that makes it a bit more complicated but likely possible.