How to get webrtc jitter buffer in firefox?

Question

I am using webrtc peerconnection.getstats to get various parameters to check the call quality in Firefox. I want to get the jitter buffer parameter, but its not exposed in the getstats response (but it is available in chrome). Also the buffer is displayed in the about:webrtc page:

Is there a way to obtain this jitter buffer in firefox?

Edit: Adding code

var pc = rtcPeerConnection;(for representation coding done elsewhere)
pc.getStats().then( function (stats) {
    for (var [key, res] of stats) {
        if( res.type == "outboundrtp" || res.type == "inboundrtp" && !res.isRemote ) {
            //expecting jitte-buffer here 
            //other params like packetslost, jitter are available here
        }
    }
}