How to open SharePoint list new form with Modern experience?

[bhoomesh]

I have created one list under in the SharePoint online modern team site.

I have created custom component and implement below code for open new form using sp.ui.modaldialog js file. 

var siteUrl = _spPageContextInfo.webAbsoluteUrl;
var demoListName = "Demo"k

function addNewItem() {
    var options = {
        url: siteUrl + '/Lists/' + demoListName + '/NewForm.aspx?IsDlg=1',
        title: 'Add New Item',
        autoSize: true,
        dialogReturnValueCallback: function (dialogResult) {
            SP.UI.ModalDialog.RefreshPage(dialogResult)
        }
    };
    SP.SOD.execute('sp.ui.dialog.js', 'SP.UI.ModalDialog.showModalDialog', options);
}

When end user click on add new button below form will be open.

I need to open the same form with Modern experiencer using sp.ui.modaldialog.js. Please check below screenshot for better understanding,


Can anyone suggest me for the same?

[#2]

@bhoomesh Are you trying to add custom JavaScript code on "modern" pages?

Or code will be added on classic page & want to open modern list form on classic page?

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[#3]

@ganeshsanap 

I have added code on classic page & want to open modern list form on that page..