What problem does this address?

Currently, columns are labeled very simply either as "Columns" for a parent block or "Column" for a nested block. When using a screen reader (NVDA specifically) this makes for a very confusing experience as noted in the following video because you're unable to know which nested column you're in:

I'm sharing this video with consent of the person who I recorded.

What is your proposed solution?

Add more descriptive labeling either using numbers or "right and left" indications to make it clear which column one is in when using a screen reader.