1. Select the New option list button
  2. Enter the name of the field which the option list needs to be available in
  3. Choose Import and select the optionlist json file
  4. Select New to succesfully create the option list

The option lists are in json format with the " replaced by %22, for example:

{%22Employee%22: [{%22Text%22: %22Employee 1%22,%22Value%22: %22Employee 1%22}, {%22Text%22: %22Employee 2%22,%22Value%22: %22Employee 2%22}]}

The Text option is displayed in the option list and the Value is displayed in the XML data file.