Requesting the ability to nest system braces and brackets, and to give them names

It would increase the reputation of Musescore as a beautiful engraving program if it could do things like this:

Yes, I know about adding extra staves in the Instruments panel. No, they will no nest like this. But if a way were possible to change to instrument within an instrument in the instruments panel then it just might nest. In other words, you have an instrument. Then on the instruments panel you add two additional staves. Then, you might right click on one of the staves, and it'll say "Change Instrument". So for example, you start out with a flute, add two more flute staves, and then turn one of those staves into a piano. Piano staves have their own braces, so theoretically it might nest like in the image, which is taken from "Ionisation" by Varese, written around 1930, so it's basically classical music by now. Also the option to give a staff a subname. So for example, a piano grand staff will say "Piano" followed by a brace. Then the subname for the top staff could be "Piano Left Hand" and the bottom staff could be "Piano Right Hand". Those subnames could follow all the rest of the names onto subsequent pages.

It can't do that right so the functionality must be added, and that's what I humbly and desperately (and rather embarassingly) ask for here.