OpenSearch.Client ext query to aws personalize

Describe the issue:

In aws personalize [documentation] we can see that it’s using ext query to use aws extension but in .net client library I couldn’t find a way to create such a query.
Could some help me how i can use aws personalize in some queries?
(Applying the plugin to OpenSearch queries - Amazon Personalize)

curl -XGET "http://localhost:9200/index/_search?search_pipeline=pipeline-name" -ku 'admin:admin' --insecure -H 'Content-Type: application/json' -d'
  "query": {
    "multi_match": {
      "query": "Toyota",
      "fields": ["BRAND"]
  "ext": {
    "personalize_request_parameters": {
      "user_id": "user ID",
      "context": { "DEVICE" : "mobile phone" }

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