I haven't seen the film myself, as their don't seem to be any screeners available. I will reserve judgment for the time being. According to The Hollywood Reporter, the film is set for release in May, 2019 - which seems to be yet another delay. That's not a good sign, as the film has been completed for some time.
‘The Chaperone’ Film Review: Jazz Era Coming-of-Age Story Could Use More Flap: Los Angeles Film Festival 2018: Haley Lu Richardson steals the show in this period piece adapted by "Downton Abbey" creator Julian Fellowes appeared in The Wrap and then in the London Telegraph. Not surprisingly, there is considerable interest in this production (with its many Downton Abbey connections).
'The Chaperone': Film Review | LAFF 2018: 'Downton Abbey' series regular Michael Engler directs Elizabeth McGovern in a period drama by British screenwriter Julian Fellowes appeared in The Hollywood Reporter.