This integration should work no only with Gmail, but also and more importantly on Protonmail... Brave is supposed to support clients' privacy and everything, but I find it ironic that the only way to program a Brave Talk session is by using Google, the opposite of clients' privacy. Please, make it compatible with Protonmail!
This plugin provides authentication tools for scheduling Brave Talk meetings within web-based Google, Proton, and Skiff calendars
It allows users to schedule meetings directly from their web-based calendar and is open source