Which preposition to use with accoucheuses

in Occurrences 3%

His design was to make me chief accoucheuse in the hospital, and to surrender into my hands his position as professor in the School for Midwives, so that I might have the entire charge of the midwives education.

of Occurrences 1%

"The undersigned, Secretary of Legation of the United States of America, certifies that Miss Marie Elizabeth Zakrzewska has exhibited to him very strong recommendations from the highest professional authorities of Prussia, as a scientific, practical, experienced accoucheuse of unusual talent and skill.

Which preposition to use with  accoucheuses