Using GetDataAsString with multiple single members like ["1", "2" ]

Hello Gurus,

I have a problem when I want to give multiple single members to GetDataAsString function.

this is not working:

var MyValue = DS_1.getDataAsString("8I2V265WZ14Y7RG485UA1EPEN", {"0EMPLGROUP": ["1", "2"] } );

error: "cannot convert from stringarray to singlememberfilter"

this is working:

var MyValue = DS_1.getDataAsString("8I2V265WZ14Y7RG485UA1EPEN", {"0EMPLGROUP":"1" } );

What is the exact syntax?

Thanks