Add rubrics text under empty staff

[mercedarian]

Hello,

I want to be able to add text under a blank section of staff. There are not any notes, then, to attach the text to. Such as, after the chant notation has finished and there is a double bar line at the end, then to write “Gloria Patri quarto tono.” as an instruction to proceed to the Gloria Patria although it is not notated there.

Is there a way to do this, or can somebody create one for me, please?

Many, many thanks.