Can 6-9, 12, and 13 pins be used as GPIO for pin assignment on the main board of the spresense?

Looking at the SPRESENSE specification, it is divided into three parts:

• CXD5602 pin name
• Ardirno pin name
• Functoin pin name

I need two UARTs and six GPIOs for an external connection, and one of the UARTs uses the micro USB of the main board CN2, and I would like to connect to the other one from GPIO.In this case, we would like to use 6-9 pins and 12 and 13 as GPIO using UART communication on 2-3 pins.

The CXD5602 pin name says 6-9, 12, and 13 pins are I2S, SPI and IRQ, but is it possible to use this as just a GPIO?