Mapping json in http plugin


Ii am using http output plugin to send data to my api's.

i am using mapping for map data and post data, here:
mapping => {"foo" => "%{host}"
"bar" => "%{type}"}

But i want to send below type of data:
mapping => {"foo" => "%{host}"
"bar" => {"foo" => %{type}, "bar" => %{host}}

But i can't do this, please help me to send this type of to my api url.

Thank you

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