this.isGeocodedItems = [
      { value: 'Y', text: '', icon: 'yes_checkbox_state.png' },
      { value: 'N', text: '', icon: 'no_checkbox_state.png' }
    ];


{
            enableCellContextMenu: false,
            editor: false,
            text: 'Residence geolocated?',
            field: 'is_geocoded',
            id: 'columnIsGeocoded',
            type: 'threestatecheckbox',
            groupable: false,
            sortable: true,
            filterable: {
              filterField: {
                type: 'combo',
                editable: false,
                items: this.isGeocodedItems,
                autoComplete: 'new-password',
                listItemTpl: (item) => {
                  return `<img style='padding-right:10px; min-width:26px; width:26px' src='../assets/images/${
                    item.data.icon
                  }'>`;
                },
                pickerWidth: this.pickerWidthCombo / 4
              },
              filterFn: ({ record, value }) => {
                return (
                  value && value === record.is_geocoded
                );
              }
            },
          },