Allow staff text line to have centered text

[andy-lyttle]

Your idea

Currently the Staff Text Line, System Text Line, and Pedal elements can have "Beginning text", "End text", and "Text when continuing to a new system". I would like to be able to specify text to be centered in the middle of the line, like this:

Or, alternately:

Problem to be solved

Handbell notation uses a "Handbells Used Chart" at the beginning of the score to show which notes exist within the score. Some of these notes may be optional, indicating whether smaller handbell choirs that only have a limited range of bells available can still play the piece. Optional notes should be marked on the Handbells Used Chart with the word "Optional" or "Opt." and a bracket as shown:

These examples are taken from the Handbell & Handchime Notation Guide from the American Guild of English Handbell Ringers (AGEHR).

Prior art

No response

Additional context

See #26659 for being able to rotate the line.

Checklist

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