Variant unwraping

Hello.

I’m trying to write bindings for ags ags docs

type baseProps = {
  name: string
}

module Label = {
  type t
  type props = {
   	...baseProps,
	label?: string,
  }
  
  @val @scope("Widget") external make: props => t = "Label"
}

module Box = {
  type t
  type widget = | Label(Label.t) | Box(t) // and more
  
  type props = {
   	...baseProps, // and additional optional fields
    child?: widget,
	children?: array<widget>,
  }
  
  @val @scope("Widget") external make: props => t = "Box"
}

I have to unwrap child and children somehow. If I’m right, I can use @unwrap this way

type baseProps = {
  "name": string
}

module Label = {
  type t = {
    widgetType: string,
  }
  
  type props = {
   	...baseProps,
	label?: string,
  }
  
  @val @scope("Widget") external make: props => t = "Label"
}

module Box = {
  type t
 
  @val @scope("Widget") external make: {
	...baseProps,
    "child": @unwrap [#Label(Label.t) | #Box(t) ],
	"children": array<@unwrap [#Label(Label.t) | #Box(t) ]>,
 } => t = "Box"
}

But in this case I can’t make fields optional. How can I solve it?
Perhaps I can write something like

module Box = {
  type t
 
  @val @scope("Widget") external make: {
	"name": option<string>,
    "child": option<@unwrap [#Label(Label.t) | #Box(t) ]>,
	"children": option<array<@unwrap [#Label(Label.t) | #Box(t) ]>>,
 } => t = "Box"
}

but it will be annoying