IBM NeuralSeek API Filter

Question

How can I filter from a specific watson discovery collection in an API Fetch?

Now I have this:

body = { 'question': 'example_question', 'options' :  {
        'language': 'es', 
        "filter": 'collection_id:28283930205-ssf2-26-25252233-525233777'   #example collection_id    
    }}
post(URL, json = body, headers=headers)