Create a dynamic JSON key

Question

I need to create a test where a JSON object is generated in a .featre setting dynamically both key and value I tried to do :

---
    * def myTestKey = 'key'
    * def myTestValue = 'value'
    * def myTest = { '#(myTestKey)' : '#(myTestValue)' }
    * print myTest
---

The output is

{"#(myTestKey)": "value"}

---

While the expected output is

{ "key":"value"}

---

Can you suggest me how to correctly set the key part? Regards

Andres