Allow Dynamic Object In $project and $addFields

Assume I have a field mapping defined in some configuration collection of my application. And this field mapping varies for different clients on my application. I would like to pass the dynamic object in my $project or $addFields stage Like: $project: { {$arrayToObject: "$field_mapping"}, } {$arrayToObject: "$field_mapping"} would return something like "email" : "$data.Email", "phone" : "$data.Phone, "first_name" : "$data.FirstName", "last_name" : "$data.LastName", "preferred_channel" : "$data.Channel", "preferred_language" : "$data.LanguageCode", "email_channel" : "$data.Email", "sms_channel" : "$data.SMS", "province" : "$data.CustomerState"

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Allow Dynamic Object In $project and $addFields