I think it should be possible to specify a different tag name that should be used when marshallng JSON.

An example use case would be a proxy renaming fields between an internal and external API:

type Example struct {
    CustomerAccountId string `jsonInternal:"kundenKontoId" json:"customerAccountId"`
}

When unmarshaling, the tag jsonInternal could be specified to unmarshal using the internal names, while when marshaling the normal json tag would be used (by default).

The current workaround is having two structs with identical fields but different tags, which feels messy.