Thank you @MattWho, the trick worked! Sadly, it worked for this simple case, but for more complex cases we couldn't find a pattern to apply it. However, we found another workaround by using literals like this: Expression Value { "${literal('$${key1}')}": "${literal('$${value1}')}", "key2": "${literal('$${value2}')}", "${literal('$${key3}')}": "value3", "key4": "${literal('value4')}" } { "${key1}": "${value1}", "key2": "${value2}", "${key3}": "value3", "key4": "value4" } It's a nasty hack, but it gets the job done! Thanks again for your help and for filling a bug report. ... View more