How can I use my Canon Eos R as a webcam ?

Hello everyone !

As the title says, I want to connect my camera Canon eos R to my PC and use it as a webcam to record YouTube videos. I plan on paring it with OBS to make it easier but when I plug everything I can't select my camera as the webcam to capture video with it.

Is there any gear I have to buy ? Some parameters to tweak ?

Thank you all for your help :'D