One way to do it (might be the same as @thefury) is:

Configure one of the I2S as slave then share the clock signal.

The GPIO trick can be referred to from components/esp_driver_i2s/test_apps/i2s/main/test_i2s.c:
i2s_test_io_config . After I2S finishes initializing GPIO, use esp_rom_gpio_connect ...

Wow!
Thank you for your answer, that is exactly what I would like to achieve.
Do you have your project documented somewhere? I would be very interested in having a look at the details,
Thanks!

Any update from someone on this topic?

Dear,

Any update yet? We also need USB hub support (to communicate to 6 devices behind the hub, if already possible).

Greetings

Searching same thing.

Same problem here... (with the table example and auto updates).