We live in a beautiful world in which, by coincidence, the UART TX/RX pins used by the test jig and exposed on the back of the module are also connected to an I2C peripheral of the STM32F. No modification of the board will be needed.
So it’ll only be a matter of coding (I2C driver code + any software to receive the data and act upon it).
This also applies to Plaits and to some extent Stages (as it would then break the chaining feature).