How do I fetch specific data from api (orderbook)?

Hi, I want to make an orderbook in my app. How can i fetch data form this api:
I want to make 2 columns, like in api 1 for price and 2 for quantity.
I did this for the price:
but api looks different:
Does any one know how to fetch specific data from list (first link)?

You can use the walking dictionary blocks to return the data you require.