As per the documentation, On-Prem and Custom Cloud customers can install and use the OCR capabilities. But, how the Pega Cloud can utilise get these capabilities? 

Pega OCR Component:

https://community.pega.com/marketplace/components/pega-ocr

Any reference documents or previous implementation scenarios will help. 

FYI... I do raise with the Pega Cloud support team to get the updates.