If you check API reference - you are not going to find hover boxes:
https://www.wix.com/corvid/reference/$w.html
I believe that working with them will be only possible using default Editor’s functionality.
I’m pretty sure that it is not possible but you can try going through Wix Support about this :
https://support.wix.com/en/article/contacting-wix-support
You could play with layering regular boxes and conditionally change their state to achieve the effect you want