Vaadin-combo-box converting array to [object Object] when using in ag-grid

Question

I am using Vaadin-combo-box in ag-grid but don't know why array converting to [object Object].

Below is code for ag-grid

columnDefs = [{
   headerName: "Students",
   field: "studentId",
   cellRenderer: this.renderStudentDropdown
}]


renderStudentDropdown(){
const records = [{"id": "123", "title" : "Student 1"},{"id": "456", "title" : "Student 2"}]
let html = `<vaadin-combox-box .items=${templates} .value='${value}' item-label-path="title" item-value-path="id"></vaadin-combox-box>`;
return html
}

after rendering in browser, its not showing data in drop down and print data like [object Object]