Hi Sangram,
I’m afraid that MCUXpresso IDE is not supported for the Cortex-M4 core of i.MX8 series of processors.
From NXP side, the provided RTOS is FreeRTOS, and is part of the SDK that could be downloaded from the following link:
https://mcuxpresso.nxp.com/en/builder
As shown on the image below, the supported IDEs for the SDK are IAR and GCC-ARM:

Hope this will be useful for you.
Best regards!
/Carlos
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