Multiple filter in dropdown field in mobile application

Hi Community,

In mobile, I found this sample below in Academy on how to add filter to dropdown field. My question is how to add mulitple filter to dropdown field. I tried below syntax but it is not working

addFilter: [

             {

                      property: "IsChief",

                     value: true

             },

             {

                      property: "IsChief2",

                     value: true

             },

]