Allow multiple parameter options

Hi,

I'm using Jaspersoft 6.3 (Community edition) and need to create reports executed via 2 scenarios;
1 - automated/scheduled  (executed via AWS Lambda function)
2 - manual/ad-hoc             (executed via AWS Lambda function via embedded UI in PEGA)

Report X has 2 parameters;
Param1 (date)
Param2 (region)

Scenario 1 requires only passing Param1 and Param2 defaulting to 'All'
Scenario 2 requires users passing Param1 and Param2, with Param2 allowing users to select 1, many or all parameter values.

I'm able to pass a single parameter value but need help to allow uers to select mulptile values or the 'All' option (as well as configure the 'All' option to be the complete list of values)

Any help would be appreciated

thanks

JS