How to configure the response-rewrite plugin to perform different rewriting tasks based on different matching conditions?

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How to configure the response-rewrite plugin to perform different rewriting tasks based on different matching conditions?
Example: I need to achieve the following:

• When the content_type is "text/html", rewrite the body as "this is html."

• When the content_type is "application/javascript", rewrite the body as "this is js."

The configuration I can think of is:
{ "response-rewrite":{ "body":"{\"code\":\"ok\",\"message\":\"this is html\"}", "vars":[ [ "sent_http_content_type", "~~", "text/html" ] ] } }
and
{ "response-rewrite":{ "body":"{\"code\":\"ok\",\"message\":\"this is js\"}", "vars":[ [ "sent_http_content_type", "~~", "application/javascript" ] ] } }
But these are two different configurations for the response-rewrite plugin. How should I configure a single response-rewrite plugin to achieve the above requirements?