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Searching Entries By Linked Content Types In Contentful with .NET SDK?

I can’t find any documentation regarding search Entries By Linked Content Types with .NET SDK. Can someone locate me or give me an example how to build a query please?
var queryBuilder = QueryBuilder.New.ContentTypeIs(ContentfulContentTypes.Article)
.FieldEquals< List < GenericLookup >>( f => f.Organization, primaryOrganizationId);

Organization field is a linked list in the article content type.
I am trying to do : article.organizations[0].Id == 12345

From what I understood, there isn’t an existing search parameter for this use case.
Here you can find all the available search parameters: https://www.contentful.com/developers/docs/references/content-delivery-api/#/reference/search-parameters, and in each code example, you can switch the platform to .NET