kicad (KiCad variant style)
Used for KiCad 10 and newer variants.
Defining them in the configuration file allows to change the comment and to define the file_id
comment: [string] (default:'') A comment for documentation purposes.
file_id: [string] (default:'') Text to use as the replacement for %v expansion.
name: [string] (default:'') Used to identify this particular variant definition.
pre_transform: [string | list(string)] (default:'_null') Name of the filter to transform fields before applying other filters..