How to set alternative text for Staff.printPartCombineTexts ?

[Alexandre Beneteau]

Hello,

Using \partcombine for orchestral score, I would like to change the
"Solo I", "Solo II" text to "1." and "2."...

I suppose it is somewhere in de doc (?) but I could not manage to find
it :-(
Just saw that I can disable such text by setting
Staff.printPartCombineTexts to false...

Does anobody know the trick ?
TIA,

        Alex.

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