autowhen2meet

This extension will allow you to fill when2meets automatically with just a few clicks.

First choose your preferred calendar app. Then the time zone where you are. Finally click on Autofill! and a popup will open to authenticate you.

The extension will analyze your calendar and fill the when2meet with your free slots.

Don't forget to modify your availability to your preference. Additionally, the extension has the option of providing your range of business hours so that it can fill out the data depending on your selection.