How to add custom filter for Kendo ComboBox -

i have used combobox displays user name(first name last name). need filter these record statrswith filter either first name or last name. if use startswith, considering first name searching criteria.

since there many names, has more 3 words can not split name in firstname, lastname.

can use below ? myjavascriptcode return true or false based on custom logic

$("#abc").datasource.filter({ field: "name", operator: "myjavascriptcode", value: value1 });