Send REST request with a multiple line request body

Question

I am trying to create a REST data set. The REST API I am querying requires the request body to be in this format:

{"index" : "test"}
{"query" : {"match_all" : {}}, "from" : 0, "size" : 10}
{"index" : "test", "search_type" : "dfs_query_then_fetch"}
{"query" : {"match_all" : {}}}

However, it seems Knowage only allows a single-line request body as shown in the image below. 

Is there a configuration I can set to allow me specify a multiline request body?