The PCIe Gen4 x8 FMC Module supports a 4-port I2C bus switch.
The part number is PI4MSD5V9546ALEX, with 0x72 as the 7-bit I2C slave address.
From I2C bus switch -Port 2, the I2C lines for the MIPI CSI are mapped to the MIPI CSI connector, and the slave address for the LI-IMX274-MIPI-M12 is 0x1A (7-bit).
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Please find the detailed product information here:
PCIe Gen4 x8 FMC Module