Extended Choice Parameter: How to load params dynamically from any file for jenkins build job Though below code works fine individually:
extendedChoice description: '', multiSelectDelimiter: ',', name: 'Capablities', quoteValue: false, saveJSONParameterToFile: false, type: 'PT_CHECKBOX',value: 'Chrome_macos10_15, Chrome_win10', visibleItemCount: 30

I need Chrome_macos10_15, Chrome_win10 need to be passed from external file.
How can it be achieved?
Use the Active Choice Parameter plugin which allows you to run a Groovy script to dynamically load values for your parameters.