Get relation of json data

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i using colymba/silverstripe-restfulapi module to get json data of a special pages(theatre Holder data). it works very fine but when it shows some data by ID, how can i retrieve the detail of this information like:

  • FeaturedImage: 243,

  • Tags: [

    • 199,

    • 200],

  • Authors: [

    • 19]