The FileDashboardParameter datatype includes various settings.

Table: FileDashboardParameter

fileNamestringyes The name of the file to use for look-ups.
valueColumnstringyes The column from where the value of suggestions are taken.
labelColumnstring  The column from where the label of suggestions are taken.
valueFilters[FileParameterValueFilter]yes Fields and values, where an entry in a file must match one of the given values for each field (see FileParameterValueFilter Table).
idstringyes The unique identifier of the parameter.
labelstringyes The label or name displayed next to the input for the variable.
orderstringyes A number that determines the order in which parameters are displayed on a dashboard. If null, the parameter is ordered after other parameters in alphanumerical order.

[a] Some arguments may be required, as indicated in this column. For some fields, this column indicates that a result will always be returned for it.