I'm planning to create a custom board using the V851 and XR829. The XR829's Wi-Fi interface will be connected to the V851, while its Bluetooth section will interface with an external MCU. This MCU will also have the ability to control the power to the V851 to enable deep sleep mode.

My goal is to achieve a very low-power standby mode (below 5mA), with the ability to wake the system using BLE.

Is it possible for the XR829 to operate in such a low-power mode and still be controlled by an external MCU?
What would be the best way to achieve this setup?