How to add Share Link Menu in Custom Tabs

Question

I am trying to add a new Menu Item to my ChromeCustomTabs for sharing the current url.

I know that we can add a default

.addDefaultShareMenuItem()

to our CustomTabsIntent. But I don't want to use this.

I also know how to add a menu item by creating a PendingIntent like :-

Intent urlIntent = new Intent();
String currentURL = urlIntent.getDataString();
Intent shareIntent = new Intent(Intent.ACTION_SEND);
shareIntent.setType("text/plain);
shareIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
shareIntent.putExtra(Intent.EXTRA_TEXT, url);
PendingIntent p = PendingIntent.getActivity(getBaseContext(), 123, shareIntent, PendingIntent.FLAG_UPDATE_CURRENT);

Now in our builder we will be adding :-

.addMenuItem("Share Current Link", p);

The code works but return an empty value instead of the current URL.

I don't know what to put in Intent urlIntent = new Intent(/*what to put here to get customTabs intent*/). We can't put our customIntent here because it is not an Intent.