Thanks for the exact reference. Now I have found it.
You asked for the meaning of the volume specific (m3) in the equation. This is due to the fact that the Lorentz force is included in other conservation equations as source terms, and source terms are always volume specific in Ansys Fluent.
Moreover, you have asked for the meaning of the volumetric charge density. The volumetric charge density is the amount of electric charge per volume. For Fluent the charge density is a material property which needs to be known. For guidance on how to determine this property I would recommend doing some background reading on electromagnetism or doing a web search for “charge density”.
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