UNO Q: Serial communication between linux and stm32 beside Arduino Router Bridge

Official Hardware UNO Family UNO Q
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In UNO Q can one use /dev/ttyHS1 for dedicated high speed data transfer from stm32 to linux ?
/dev/ttyMSM0 i believe is for arduino router bridge. I wanted to use Serial2 on stm32.
If it cant be done at software level, can spare Rx Tx pin be hardware configured to directly communicate with linux so as to get a separate channel of data transfer between linux and stm32?

I am at very beginning of trying this, so before trying just want to know if this sounds feasible

thanks

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Figue-1:

In Fig. 1 above, we can see four communication buses (Bus-2 does not exist). Among them, Bus-3, which is the Serial Wire Debug (SWD) bus, is dedicated to programming the MCU flash memory with code and data.

Bus-4, which appears as ttyHS1/UART2 on the MPU side and LPUART1/Serial2 on the MCU side, is dedicated to the Router Bridge for high-volume data exchange between the MPU and MCU.

This leaves Bus-5, which you can use for high-speed data exchange between the MPU and MCU. It is based on the SPI interface. To use this bus, you need to write a C++ sketch for the MCU side and a Python script for the MPU side to exchange data. You may find this thread @philippe86220 interesting.

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What is your progress in this regards?