Build Tool That Identifies Which URLs Within Sitemaps Are Not Indexed

Issue: Currently we have seven sitemaps submitted to Google, with a grand total of about 300,000 URLs, but our indexation rate remains below 60%. Ideally, we would like to have all of our submitted URLs indexed within Google. Solution: We would like you to create a tool that can go into our Sitemaps, and identify which pages have been indexed within Google, and which ones have not. There would be seven different outputs since there are seven sitemaps. Then, the information would be transferable to a CSV file so that we could manipulate the data and find out which sections of pages are not being indexed. This means that the deliverable of the project, is a tool that will allow us to upload our .[login to view URL] files to it, and find out which URLs within the sitemaps are indexed and which ones are not. Once I select you for the project, I will point you to where the sitemaps are located. I figure you will need Python to create the tool, but I'm not a developer, so maybe you know of another way! Thanks so much, and I look forward to working with you!