12 bit transmission on Arduino Nano BLE?

Hello,
I am reading analog data with analogReadSerial set to 12 bits and have confirmed that it works. However, when I try to send the data over BLE, I can only receive 8-bit data. How do I configure BLE to transmit 12 bits?

Split the 12 bits to 2 x 8 bits, then recombine them at the other end.

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