Basic plan - choose a new host prior to the start of the meeting

Welcome to the Zoom Community, @lizzybear.

The basic answer (sorry for the pun) is no.  But if this is someone you trust, and you don't need to do this frequently, you can use the Host Key method to allow someone else to take Host privileges upon entering a meeting which has no Waiting Room and also has Join Before Host enabled:

https://support.zoom.us/hc/en-us/articles/205172555-Using-your-host-key