How to use hdmi speaker as output when using usb-c to hdmi adaptor?

[MatthewVoyceGlobal]

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Description

Here is use case, when I use adaptor connect iphone/ipad to hdmi monitor (with speaker), I want to force the audio sound out from the hdmi speaker. The playing ring tong comes from the hdmi speaker, but as long as the video room initialed all the sound come from the ipad/iphone speaker, I guess there is some overwrite when the sdk audio track initialed, so I search the twilio video document and try to overwrite the audio output devices, but the document seems like un finished, I put code into the block(The following code is what I am using).

            TVIConnectOptions *connectOptions = [TVIConnectOptions optionsWithToken:self.videoAccessToken
                                                                              block:^(TVIConnectOptionsBuilder * _Nonnull builder) {
                                builder.audioTracks = self.localAudioTrack ? @[ self.localAudioTrack ] : @[ ];
                builder.videoTracks = self.localVideoTrack ? @[ self.localVideoTrack ] : @[ ];               
                builder.roomName = roomName;
            }];
            TVIDefaultAudioDevice * defaultDevice =  [TVIDefaultAudioDevice audioDevice];
            defaultDevice.block =^ {
                kTVIDefaultAVAudioSessionConfigurationBlock();
                AVAudioSession * session = [AVAudioSession sharedInstance];
                [session setActive:YES error:nil];

                [session setMode:AVAudioSessionModeVoiceChat error:nil];
                [session setCategory:AVAudioSessionCategoryPlayAndRecord error:nil];
                [session overrideOutputAudioPort:AVAudioSessionPortOverrideNone error:nil];

            };
            dispatch_async(dispatch_get_main_queue(), ^{
                TwilioVideoSDK.audioDevice = defaultDevice;
                defaultDevice.block();
                _room = [TwilioVideoSDK connectWithOptions:connectOptions delegate:self];
                [self fetchConferenceInfo];
            });

And my question is
1 does twiliovideo sdk support change output device?
2 if question 1 is yes, how can I do that, any document or reference I can learn