How to set vitual backgroup with lib-jitsi-meet API?

Hello
I have a question How to set vitual backgroup with lib-jitsi-meet API?
I read document and search but can’t find any way to set vitual background by jitsi api.
Any body can’t help me

The implementation is in jitsi-meet.

Isn’t lib-jitsi-meet API has implementation?
Can’t i do it?

lib-jitsi-meet is a low level API. It is doing only one thing: interfacing with a Jitsi server.
jitsi-meet is a web application and cares about the graphical stuff, the icons, the screen disposition, and cares about the virtual background. So if you want virtual background in your application, you will use lib-jitsi-meet for interfacing with the server, and do the rest yourself - including virtual background.