This Commented CUE demonstrates how to use the built-in function encoding/json.Compact to transform CUE data into a single line of JSON with all insignificant whitespace removed.

file.cue
package example

import "encoding/json"

compact: json.Compact(json.Marshal(data))
data: {
	a: 1
	b: {
		c: "two"
		d: 3.0
	}
	e: false
	f: [
		4,
		5.0,
		"""
			A
			Multi
			Line
			String
			""",
	]
}
TERMINAL
$ cue export file.cue -e compact --out text
{"a":1,"b":{"c":"two","d":3.0},"e":false,"f":[4,5.0,"A\nMulti\nLine\nString"]}