Recognize component references deeply nested inside an object provided as function argument

[vatro]

Given:

<!-- comp.svelte -->
<script>
export let props_obj = { foo: 1 }
$: if (props_obj) console.log("reactive on 'foo' change!")
</script>

// App.svelte

function do_something( obj ) {
 // component reference deeply nested inside an object provided as function argument
 // props_obj not reactive
  obj.data.comp_ref.props_obj.foo = 2
}

props_obj is not reactive. -> we would like it be reactive, like e.g.:

Given:

// App.svelte

let comp_ref // top-level declared component reference

function do_something() {
  // props_obj reactive
  comp_ref.props_obj.foo = 2
}

props_obj is reactive.