How to .. enter ranged staves text with line range

Is there some functionality to highlight text ranges between staves (in Dorico 3 Elements)? I’ve added a picture to illustrate it.

No, there’s nothing quite like that in any version of Dorico at the moment.

Thx. could this be considered in a future update (similar to repeats, where you can define start and end on staves) ?

Yes, I’m sure that as Dorico’s capabilities to draw lines are expanded in future, this kind of thing will become easier to produce.