jefe vs line manager

jefe

noun
  • A boss in a business, company, or other organization. 

  • An officer with political influence; a head or chief in government, such as a sheriff, particularly where that person is Hispanic or of Mexican descent. 

line manager

noun
  • The manager who is directly responsible for an employee. 

How often have the words jefe and line manager occurred in a corpus of books? (source: Google Ngram Viewer )