Using RAPI I2C on Limenet-micro

Hi I want to implement the Langstone implementation on the Limenet micro. The original design uses a RAPI and a LimeSDR-mini. This application uses the GPIO or an I2C expander for controlling the tranceiver. Unfortenately scanning through the hardware doc these are not available on a connector.
Is there a way to connect the I2C to an expander? Or is there an other way?