Im trying to use helper functions in a someOf array but i cant get it to work, it always prints out the helper function as a string instead of executing it. How can i make it execute the functions?

I already tried to put the helper functions into variables but the variable call doesn`t get executed too.
This is what im trying to do:

"Attrs": {
    {{someOf 
    (array 
      '{"Attr1": {"DC": {{date '1970-01-01' '2024-05-08' "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'"}}, "DM": {{date '1970-01-01' '2024-05-08' "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'"}}, "ID": {{int 000 999}}, "Short": {{int 000 999}}, "Value": {{lorem 1}}}}' 
      '{"Attr2": {"DC": {{date '1970-01-01' '2024-05-08' "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'"}}, "DM": {{date '1970-01-01' '2024-05-08' "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'"}}, "ID": {{int 000 999}}, "Short": "{{int 000 999}}", "Value": {{lorem 1}}}}' 
    ) 1 2}}}
  },