Hi anna,
you can customize the operations list with custom operations and set custom editors for each operation but the Property field can not be changed. It is always a drop down list that allows to select an operation. Here’s a demo that illustrates how to create custom operations with custom editors.
With the label attribute of each field object in the fields property of the Smart.QueryBuilder you can customize the label that will appear in the drop down list item for the property. The filterOperations attribute defines the list of operations that will be available for selection via the operations drop down list.
Best Regards,
Smart HTML Elements Team