{name, "exp"}.
{jsx, [start_array,start_array,
 {float,2.0e7},
 end_array,
 {float,2.0e7},
 start_object,
 {key,<<"key">>},
 {float,2.0e7},
 {key,<<"another key">>},
 {float,2.0e7},
 end_object,
 {float,4.2e70},
 end_array,end_json]}.
{json, "exp.json"}.