Please add a way to name groups (braces, brackets) and then set the staff names to numbers.
Notion doesn't offer any way of naming braces, brackets, nor renaming staves or adding arbitrary text, so orchestral notation "as it should be" is not possible. Also, choirs (S T A B) and 3-staff organ or piano Brace or Bracket groups can't be correctly organized.
In the example below I illustrate the desired effect.
I am also attaching a mockup for a possible solution, in which:
1. Create Group (brace/bracket) opens a dialog to add the name of the group (optional, might be left blank)
2. Under the instrument settings, there's a new field: Group Abbreviation. (or any text that explains it's the name if under a group)