A capo in a subtitle and in the names of instruments

[Son_V]

Hi all, 
I would like to know what is in the subject.
The subtitle is very long and I would like to put an A capo somewhere.

For the names of instruments, the original score have for the voices
"Soprani o Tenori" and "Contralti o Bassi".

They are written in a long line.

I would like to obtain something appearing like below:

Soprani
o Tenori

and

Contralti
o Bassi

centered with their pentagram.

How can I obtain this?

Many thanks.



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