Mongoose returning empty object for setter value

I'm trying to have a mixed type for my schema - my type is {type: value: {type: Number}, label: {type: String} }

I want to transform value being saved with setter function but the SETTER returns an empty object. {}

  @Prop({type: {value: {type: Number}, label: {type: String}, minimize: false, set: (v: any) => console.log(v)})
  custom_id:  {
    value: {type: number},
    label: {type: string}
  };

Also tried with schema type

 @Prop({type: {value: {type: Number}, label: {type: String}, minimize: false, set: (v: any) => console.log(v)})
  custom_id:{
    value: number,
    label: string
  };

@Schema()
class CustomId {
  @Prop({type: Number})
  value: number;

  @Prop({type: String})
  label: string;
}

export const CustomIdSchema = SchemaFactory.createForClass(CustomId);

@Prop({type: CustomIdSchema, minimize: false, set: (v: any) => console.log(v)})
custom_id: CustomId;

It's worth nothing im populating the field via a plugin schema.plugin(AutoIncrement, {inc_field: 'custom_id.value', inc_amount: 0o1, start_seq: 0o1});

The value gets saved successfully but i want to add a label to it