What is the correct way to use dynamic field names in MongoDB?

Question

MongoDB

Surely the question is not immediately clear.
I have the following query to change data:

db.collection(history).updateOne(
    {user:req.body.user.toLowerCase()}, 
    {$set:{<filed_name>:0}}, 
    function (err, docs) {
        if (err) {console.log(err); return false}
        console.log('[docsModified: ' + docs.result.nModified + ']');
})

It is necessary to make sure that `filed_name` can change depending on the function parameter, i.e. I want to set the name of the field to be changed. In fact, there is a user base that has balances of various currencies, and so I need to reset the balance by the name of the currency (field).