Add popup on clicking custom button in product edit page in admin in magento 2.3

I have added a custom button in product edit page using product_form.xml like below :

app/code/Company/Module/view/adminhtml/ui_component/product_form.xml

<?xml version="1.0" encoding="UTF-8"?>  <form xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Ui:etc/ui_configuration.xsd">     <argument name="data" xsi:type="array">         <item name="buttons" xsi:type="array">             <item name="set-to-sold" xsi:type="string">Company\Module\Block\Adminhtml\Product\Edit\Button\SoldButton</item>         </item>     </argument> </form> 

app/code/Company/Module/Block/Adminhtml/Product/Edit/Button/SoldButton.php

<?php /**  * Copyright © Magento, Inc. All rights reserved.  * See COPYING.txt for license details.  */ namespace Brainvire\ProductType\Block\Adminhtml\Product\Edit\Button;  use Magento\Catalog\Block\Adminhtml\Product\Edit\Button\Generic;  class SoldButton extends Generic {      /**      * @return array      */     public function getButtonData()     {     return [         'label' => __('Diamond is SOLD'),         'disabled' => true,         'on_click' => "deleteConfirm('" .__('Are you sure, you want to change the status to SOLD of diamond ?') ."', '"             . $  this->getUrl('producttype/product/sold') . "', {data: {}})",                         'class' => 'save primary',         'sort_order' => 5,     ];       } } 

This is working perfectly. A button is added, and a confirm box is also displayed on button click. But now i want to add a popup and call custom phtml in that popup on button click.

Any ideas how to proceed. Thanks in advance.