Morph on failure

I have a type

const T = type({ id: "string>0", label: "string>0" })

const T = type({ id: "string>0", label: "string>0" })

and objects of type

{ id: string>0, label?: string>=0 }

{ id: string>0, label?: string>=0 }

and want to create a type that will try to morph with

(o: { id: string>0, label?: string>=0 }) => { o.label ||= o.id }

(o: { id: string>0, label?: string>=0 }) => { o.label ||= o.id }

only on failure, and then try to revalidate with the same validator
What's the best way to do that?