Make left and right margin with text in it

[Maarten Deen]

How do I accomplish the example in the attachment?
- make a larger right margin for one line and put text (preferably split in two 
lines) in that margin
- make a left margin for one line and put text in there

I suspect that this can be done with \override, but I can't find the exact 
command for it.
The text in the left margin can be done with \set Staff.instrumentName but that 
does not indent the line.

Maarten