Not that I know.
Here are some resources:
Writing Word Macros: An Introduction to Programming Word using VBA: PhD Steven Roman
https://wordmvp.com/FAQs/MacrosVBA/index.htm
Installing Macros
VBA Code Examples (3)
Install/Employ VBA Procedures (Macros)

I do not want to throw cold water on your enthusiasm, but

1. You need a clear idea of how you would do this manually.
2. This is going to be a big project and you should realize that I doubt it will ever work very well.
3. Footnotes/endnotes are a component of Word. Anything you come up with will not give the same performance.
4. I cannot imagine a way to keep the linking that is currently there with footnotes and endnotes.

If you simply want to pull text to the side or a margin, look into using Text Boxes or Frames. Frames and Textboxes in Microsoft Word
Those can be anchored to a particular paragraph of text.

Also, would Comments work for what you want?