Azure Cognitive Services, Speech Studio, Text-to-speech, Audio Content Creation, personal use project

i like using Azure Cognitive Services/Speech Studio/Text-to-speech/Audio Content Creation to narrate books for my personal use. At the moment it is a very manual process. My current process: A book for example has about 400,000 characters and due to the 20,000 total character limit in "Audio Content Creation": i convert my epub to .txt and split that text document into about 20 smaller text files with about 19,999 characters. I then manually copy and paste the 19,999 characters from the first divided text file and enter it into azure's Audio Content Creation. I choose my narrator (I use the same narrative every time "Libby" from "English (United Kingdom)") and I then click on "export" and select "export to local disk", i then select "audio format" and then select "48k mp3" and then i select the "export" button to save the file to my computer. About a minute later the file is saved to my computer. I repeat this process another 20 times. What i would like: If possible i would like a batch file to automate "my current process". I put my 20 divided text files in a folder and the n double click on my batch file and that is it. Is such a thing possible?