How do I send userID as an object when using Jitsi meet?

You can send user name and alias name in userID object. Here is the code in Jitsi meet. 

this.userID = {
            aliasName: Strophe.getResourceFromJid(jingleSession.room.myroomjid),
            userName: Settings.getCallStatsUserName()
        };

https://github.com/jitsi/lib-jitsi-meet/blob/a90976f932ea279e845cda100aafbdb2116ab7ab/modules/statistics/CallStats.js#L365