With Vi mode enabled, ngg will move your cursor to the nth line in the cell.

This could be very useful for longer cells, but without line numbers visible, it's difficult to move precisely.

So the ability to toggle dynamic line numbering would be super helpful. For example, like this:

1 | In [5]: """
2 |    ...: This
3 |    ...: is
4 |    ...: a
5 |    ...: multiline
6 |    ...: string
7 |    ...: """

Bonus points for a relative numbering as well, but one thing at a time ;)