I don't think it's a limitation of the hardware since at least on Android I tested some BT audio devices like my speakers and a headset and those profiles are not listed there either. The BT module is controlled via one UART and has a PCM interface with full duplex to the audio-codec, so I guess it's a question of getting documentation or drivers from Realtek? The module gets loaded with a firmware during initialization, I guess it also depends on what profiles are in this binary blob...
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