Play AVSpeechSynthesizer (TTS) via Apple Watch Speaker

Hi everyone. This is my first post on these forums, because this is first time I have not found any clues on internet regarding this question.

I need to play sound (text to speech generated by AVSpeechSynthesizer) using a built-in speaker on Apple Watch Series 4+ (WatchOS 6.2.6+).

I was able to make it work for Series 3. However, for series 4, it doesn't play via speakers, it plays via Bluetooth AirPods if they are connected, but they are not – there is no sound at all.

Is it even possible to do? Any advice would be highly appreciated.

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I'd like to know the answer to this too. Anyone help?