Api filter multi-level

Hi, i have a multi level content that looks like this
“title”: “myTitle”,
“sections”: [
{ “id”: “1”,
“title”: “section title”
{ “id”: “2”,
“title”: “section 2 title”

I want to make a call to the api with a filter by sections id but i have tried many things, like

api/content/items/MyObject?filter={'sections.id': '1'}&token=xxx

and nothing is working. How can I filter multi level with cockpit version 2.6 ?

Thank you for any help.