Show telephone symbol in Calendar when using arbitrary video conferencing tools

Due to the current situation I'm using a lot of video conferencing software to meet with other people. I organise my daily schedule using Apple Calendar Version 11.0 and noticed that when I'm using a Zoom link as the location for an event, a nice telephone symbol appears. When clicking on it I get redirected to the said link and can conveniently open Zoom. However, when I use less popular video conferencing tools (e.g. https://bigbluebutton.org/) this doesn't work. Is there a way to achieve the same behaviour for less popular tools as for e.g. Zoom?