How to pass request parameters with $fetch ?

filter: {
  include: ['images', 'category', 'attributes']
}

get: filter=%7B%22include%22:%5B%22images%22,%22category%22,%22attributes%22%5D%7D
must: ?filter[include][0]=category&filter[include][1]=attributes&filter[include][2]=images

get: filter=%7B%22include%22:%5B%22images%22,%22category%22,%22attributes%22%5D%7D

must: ?filter[include][0]=category&filter[include][1]=attributes&filter[include][2]=images