Feedback for “Type Merging Transform”

[jasonseminara]

I'd like some more examples of computed fields.

I have the following schema, and I'd like to compute some fields:

type Sales {
  totalCommissionYTD: Float
}

type Seller {
    commission: Float
    # This field should be invented based on (commission / totalCommissionYTD)
    #  commissionPercentOfTotal: Float
}  

How would I write this in my mesh.yml?