reference another fixture without using label rails

I have this model called Region and Admin

# regions.yml 
one: 
  name: test
two:
  name: test2

# admins.yml 
one:  
  name: admin1
two: 
  name: admin2

There's a column on admin.rb defined as json columm (store_accessor: :region_ids). How can I reference regions on admins.yml?

# admins.yml
one: 
  name: admin1
  region_ids: ?????