Inserting key to documents where it doesn't exist and update it wherever it does

I recently started using mongolite. And I am having trouble reproducing some MongoDB queries in R.

I want to do something like this

update_training_month <- function(month){
  m <- mongo(collection = trained_model, db = database)
  m$update({'month': {"$exists" : FALSE}}, {"$set": {'month': month}})

So the month field doesn't exist and I want to update it.

Moreover, I want the month field to be a variable to be input by the user but I am unable to define a function like that because that throws an invalid JSON error.
I have referred to the documentation. But haven't found solutions to my queries.
Could someone please help me with this?

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