Filter objects within objects by keys [closed]

I have a data structure like this :

const data = {
    "CHI" : { fr: "chien", en: "dog"},
    "CHA" : { fr: "chat", en: "cat"},
    "POU" : { fr: "poule", en: "chicken"},
    "OIS" : { fr: "oiseau", en: "bird"},
}

From wich I would like to create 2 objects like this :

// #1

const fr = {
    "CHI" : "chien"},
    "CHA" : "chat"},
    "POU" : "poule"},
    "OIS" : "oiseau"},
}

// #2

const en = {
    "CHI" : "dog"},
    "CHA" : "cat"},
    "POU" : "chicken"},
    "OIS" : "bird"},
}

Many thanks !