Google cloud print on ios

I recently switched from a long time user of Android to an IPhone.  I have come to find out that it's not so easy to print from ios if your printer is not an air printer.  With android, it was always easy to print directly within any app through Google's own cloud services that i set up to my own cloud enabled printer.  https://en.wikipedia.org/wiki/Google_Cloud_Print However with an app called Print Central Pro which costs 5.99, it integrates directly into your share button on the iPhone  or ipad.  Now, within each app of Google's apps, you can print directly to your cloud printer for free.  I have not been able to find a way from GMail though. Gdrive, and all google docs apps on your iPhone are fine.