curl --request POST \
  --url https://api.example.com/experimental/operator/press-key-by-index \
  --header 'Content-Type: application/json' \
  --data '
{
  "element_index": 123,
  "key": "<string>",
  "modifiers": [
    "<string>"
  ]
}
'

{
  "success": true,
  "message": "<string>"
}