Leadsheet-Style: Marks on Tempo and Style/Feel on top left margin

Leadsheets in Pop/Jazz often start with instructions on tempo along with style/feel on the top left. As it's an instruction for the whole song, it's not sticked to a particular note/rest (nor bar, nor stave nor staff) but orientated to the left margin, placed just below title and authors. Up to now it's manual work but no stable alignment possible: if for example the key signature changes afterwards (i.e. some flat-b's or sharp#'s added, especially when using 'concert pitch' for brass instruments) or if a new bar is added before the first one (tempo and style&feel then move to the then second bar) you always have to re-justify it. In addition, any rehearsal mark added ("INTRO") is auto-placed on top of all that. 🙈

As I didn't come across any other hack yet:
Would it be possible to invent maybe something like a new particular text object "Style/Feel" (orientated to the margin not to a specific note/rest, and auto-placed above any rehearsal mark)? The same with a general tempo marking that ist not only sticked to a specific note/bar but shown above all for the whole song?

Attached you'll find a screen - which maybe explains my request better than the words above ;-)

Please nudge, if this is already possible...