Overriding defaults in anchor

Hi, Is there a way to override defaults in anchor ?

default: &defaults
 foo: "yes"
 bar: "true"

data:
 "name1":
   "phone": 617
   "foo" : "no"
   <<: *defaults
 "name2":
   <<: *defaults 

Does this work for example changing just the value of foo from yes to no for name1 ? If not, do you have any ideas? 

Thanks.