[Avodah] ...She'taaseh L'maan Kedushas Chasadecha...

[Moshe Y. Gluck]

The Yehi Ratzon commonly said before the end of Bircas Kohnim was, according
to Siddur Rashban, established by the Ari Hakadosh. Other Siddurim brought
down that the Sefer Shaarei Tzion says to say it (instead of repeating
Ribono Shel Olam a third time). Does anyone know where I can find out more
information about the source of this Nusach? I would assume it's somewhere
in Kisvei HaAri, but I have no clue as to how to find it.

KT,
MYG