Add parent and child value to the cascade field

[Petr AST]

Dear Community!

Is it possible to add both a parent value and a child for it through the API?

POST https://domain_name.atlassian.net/rest/api/3/field/customfield_10071/context/10175/option

The child value is added only with the optionID, which corresponds to the parentID.
But how to get this parent ID at the time of creation?
Maybe there are alternatives to create both parent and child for it at once?

{
   "options": [
   {
      "disabled": false,
      "value": "New_parent_value"
   },
   {
      "disabled": false,
      "optionId": 10126,
      "value": "New_child_value"
   }
]
}

 Thanks in advance!