How to get the current intensity in the body after electrical stimulation instead of the current density?

Because I am currently doing electrical stimulation simulations related to the human body, I use the EM LF module for related simulation design, but the results are only the electric field strength, current density, and electric displacement vector. But I want to know the specific current strength and the current intensity at a certain muscle of the human body. How to calculate and analyze

The easiest way I found is to use the power (I=P/V) as it shows you the current lost in different parts of the model as well as overall. have a look at what was mentioned here