Updating an array in the database

I want to update an array in my database with a users ID, for testing purposes i'm trying to just push a string to the array.

When i do it in the tester with,
{"__op":"AddUnique","objects":["user"]}
%% this works perfectly.

When i do it inside of the datasource,
return '{"__op":"AddUnique","objects":["user"]}';
%% this does not work
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