This seems a rather trivial question, where the answer is "it depends on your field".
However, the importance of the representation of objects cannot be understated. Your field may be full of errors, it is good practice to correct them and propose best practices.
For the best practice, you have to refer to the following literature:
For example, the first publication describes that, based on the other publications
Square brackets enclose suffixes of unit symbols that change the
meaning of a unit stem. [...]
For example 1 m H2O is written as “ m[H2O]” in The Unified Code for
Units of Measure because the suffix H 2O changes the meaning of the
unit atom for meter (length) to a unit of pressure.
Interesting reading. Unfortunately I do not have the time to fully answer your question. Feel free to read through the material and self-answer yourself.