As I mentioned the Kendo UI DataSource is designed to work with flat data. Since there is no option to define a type of 'object' or 'array' there is no built-in filter mechanism for such data types.
There is a built-in number filtering, but it expects the cell to contain a single number value, not an array. The data structure should look like this in order to use the built-in number filtering:
Regarding the operator - the logic for the operator should be defined as separate function. For testing purposes in the provided how-to there is only one operator. It checks whether any of the values selected by the Kendo UI MultiSelect matches one of the numbers in the cell.
Since such data type is not supported by the Kendo UI DataSource there is no built-in filter operators for working with an array of numbers. Such operators should be implemented by the developer in the same way as the one used in the example.
In order to have more than one operator you can define Kendo UI DropDownList list and pass the selected operator to the Kendo Ui DataSource filter method.