The incompatibility is apparently due to the fact that jq is happy with a concatenation of JSON objects and q is not. For example {'foo':1}{'foo':2} as opposed to [{'foo':1},{'foo':2}]
Yes, but the inputs to jq are not JSON, they are "a sequence of whitespace-separated JSON values which are passed through the provided filter one at a time" which is the relevant thing if you are going to try to replace jq.
The comma operations means that the "filters" are duplicated, so instead of one json state you would pass two if there's one coma; and ofcourse any number of commas are allowed.
