Move identation line to the right

[jpmvferreira]

Hi, so instead of using the indentation like so

I would like to be able to have it like so

Maybe I overdid the image edition to the right but you get the point.
Having an offset option available would be really cool, and it should respect the colors defined in the package, but I see that this repository hasn't gotten much attention in the last few years, and my knowledge is zero here.

Unrelated but does anybody know if it's possible to add a vertical line between line numbers column and the rest of the text? That way it would have a much more consistent behavior.