Programmatically fill repeaters in EditRecord page

Is there a way to fill repeaters in an EditRecord page with some values ?
Using

->default()

->default()

is only possible on a CreateRecord page IIRC.

I've tried directly using

$form->fill([
  'repeated_field' => [
    ['key' => 'value'],
    ['key' => 'value'],
    ...
  ]
]);

$form->fill([
  'repeated_field' => [
    ['key' => 'value'],
    ['key' => 'value'],
    ...
  ]
]);

but nothing gets added to the repeater, and if i

dd()

dd()

the form raw state right after, this is what i get :

array:1 [
  "repeated_field" => []
]

array:1 [
  "repeated_field" => []
]