Conditionally preserve values from the destination object

[sbogeFS]

Is your feature request related to a problem? Please describe.

I wanted to preserve values in the destination object if the value is undefined or null in the source object of the mapping for instance by updating a value.

Describe the solution you'd like

I wonder if it would be possible to have something like that:

createMap(mapper, SpecialOrderDto, CommonOrder,
      forMember(
        (destination) => destination.id,
        mapFrom((destination, source) => source.id ?? destination.id)),
      )
)

Describe alternatives you've considered

Currently I have to implement this logic without automapper.

Additional context

After posting this issue I wonder if mapWithArguments could be the correct way to handle this problem?