Using params in JSON API data source for Grafana

I am working with JSON API data source for Grafana.
The article: Query Editor | Grafana Enterprise plugins documentation
Using category=movies works fine on Params for JSON {“category”} but when I want to add attributes.category (the second level of inclusion in JSON file) into params from JSON:
{ “attributes”: {
“category”: [

It does not work. I added attributes.category and nothing was searched.
Please help us how to write correctly such example in Params?