Check out example codes for "bibtex remove brackets in note field". It will help you in understanding the concepts better.

Code Example 1

# LaTeX - It swap the field from note to addendum 
# that by default has no brackets

\DeclareSourcemap{
  \maps[datatype=bibtex]{
    \map{
      \step[fieldsource=note, final]
      \step[fieldset=addendum, origfieldval, final]
      \step[fieldset=note, null]
    }
  }
}

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