MCT8329A: how to set current limitation

I also have doubts about the current sensor section，The calculation formula given in the manual is as follows

Does 'I' in the formula represent the real current ?

And in the reg map, the values of CSA_GAIN are as follows

But in the gui，they are 0.15V/A, 0.3V/A, 0.6V/A and 1.2V/A

In addition, why is there no sampling resistance present (0.001Ω in evm board, How does it work)

Our customized board has a rated current of 5 amperes and a sampling resistance of 0.02 ohms. I don't know how to set register parameters to realize current limitation