Adding an incremental prefix to bates numbering

The New Zealand Judiciary have recently changed changed how they want documents numbered for court hearings. I have been trying to find out how to bates number using JS with no success so i am hoping you all can help.

Basically what is required is that every document in a court bundle needs to be paginated. Easy. However the pagination needs a prefix to also reflect the (printed) volume number the document is in. Which is fine i can do each volume separately but i was hoping for a more automated approach.

So for example the bundle might be paginated like

Volume 101

doc one is paginated 101.0001-101.0250

doc 2 is paginated 101.0251-101.0300,

Volume 102

doc 3 is paginated 101.0301-102.0400

doc 4 is paginated 102.0401-102.0599

Volume 103

doc 5 is paginated 103.0600-103.0700

My current method is to combine the documents into pdf files for each volume (named as the volume number), then bates number using Adobe's Bate numbering function and manually insert volume number as a prefix. What i was hoping for was a JS that would take these volume pdfs and then either:

1. insert the filename (truncated to remove "pdf") and then add a bates number; or

2. insert a prefix that incremented by file and then added a bates number. In this option it would be great to be able to choose the starting volume number

Any help is appreciated. Thanks