Hi,
Jayprakash from IndicTechCom has developed a tool to OCR by using Google Drive API - https://tools.wmflabs.org/indic-ocr/
The tool can be accessed in Wikisources by loading this js - https://meta.wikimedia.org/wiki/User:Indic-TechCom/Script/IndicOCR.js
The tool was developed as Google OCR by Cloud Vision API was not supporting Malayalam, Telugu, Oriya, Gujarati and Kannada. So, the OCR button created by Community tech was not working for this language Wikisources. The new button will support these languages as well all other languages supported by Google Drive API
Also, by introduction of this tool, we now have 4 options to OCR in Wikisource. :-)
Regards, Bodhisattwa