Custom UI - video meet, participant and chat in one display

[meit.rkn]

Hi, im a newbie with Jitsi. I have project to use meeting SDK on my android apps. i want to implement video meet, participant and chat in one display. but i dont know how to call chat feature. this is my code and my screenshoot to get video meet view :

class MainActivity : JitsiMeetActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        val view = JitsiMeetView(this@MainActivity)
        val options: JitsiMeetConferenceOptions = JitsiMeetConferenceOptions.Builder()
            .setServerURL(URL("https://meet.jit.si"))
            .setRoom("testing")
            .setAudioMuted(true)
            .setVideoMuted(false)
            .setAudioOnly(false)
            .build()
        view.join(options)

        val displayMetrics = DisplayMetrics()
        windowManager.defaultDisplay.getMetrics(displayMetrics)

        var width = displayMetrics.widthPixels
        var height = displayMetrics.heightPixels / 2

        videoView.addView(view, width, height)
    }
}

This is UI that i want :

Please help, Thankyou