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DropDownList options with tooltip in JavaScript DropDownList control

You can achieve this behavior by using ej2-tooltip component. When the mouse hover on the DropDownList option that tooltip display some details related to hovered list item.

Source
Preview
app.ts
index.html
import { DropDownList } from '@syncfusion/ej2-dropdowns';
import { Tooltip } from '@syncfusion/ej2-popups';

 //Initialize DropDownList component
let listObj: DropDownList = new DropDownList({
    // define the array of JSON data
    dataSource: [
        { id: '1', text: 'Australia', content: 'National sports is Cricket' },
        { id: '2', text: 'Bhutan', content: 'National sports is Archery' },
        { id: '3', text: 'China', content: 'National sports is Table Tennis' },
        { id: '4', text: 'Cuba', content: 'National sports is Baseball' },
        { id: '5', text: 'India', content: 'National sports is Hockey' },
        { id: '6', text: 'Spain', content: 'National sports is Football' },
        { id: '7', text: 'United States', content: 'National sports is Baseball' }
    ],
    // map the appropriate column to fields property
    fields: { text: 'text', tooltip: 'id' },
    // set the placeholder to the DropDownList input
    placeholder: 'Select a country',
    // bind the DropDownList close event
    close: () => { tooltip.close(); }
});
listObj.appendTo('#ddltooltip');

//Initialize Tooltip component
let tooltip: Tooltip = new Tooltip({
    // default content of tooltip
    content: 'Loading...',
    // set target element to tooltip
    target: '.e-list-item',
    // set position of tooltip
    position: 'top center',
    // bind beforeRender event
    beforeRender: onBeforeRender
});
tooltip.appendTo('body');

function onBeforeRender(args: TooltipEventArgs): void {
    // get the target element
    let listElement = document.getElementById('ddltooltip');
    let result: Object[] = listElement.ej2_instances[0].dataSource;
    let i: number;
    for ( i = 0; i < result.length; i++) {
        if (result[i].text === args.target.textContent) {
            this.content = result[i].content;
            this.dataBind();
            break;
        }
    }
}
<!DOCTYPE html>
<html lang="en">

<head>
    <title>Essential JS 2 DropDownList</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Typescript UI Controls" />
    <meta name="author" content="Syncfusion" />
    <link href="styles.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-base/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-inputs/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-dropdowns/styles/material.css" rel="stylesheet" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
</head>

<body>
    <div id='loader'>LOADING....</div>
    <div id='container' style="margin:0 auto; width:250px;">
        <br>
        <div id="Tooltip" class="e-prevent-select">
            <input type="text" id='ddltooltip' />
        </div>
    </div>
</body>

</html>