Karate: Unable to move schema definition out of feature file

I'm able to successfully run the Feature/scenario, When I define the schema inside my feature file .

Here is a simplified example of the schema.

Background:
  ...
  ...
  * def accountSchema = { id: '#number? _ >= 0', prop1: '#number? _ >= 0', prop2: '#string', prop3: '#string', optionaProp: '##string'  }
  * def userAccountsSchema = ({ entitledAccounts: '#[] accountSchema',  prop5: '#number' , prop6: '##string'})

And here is how I'm validating

Scenario:
  ...
  ...
  When method GET
  Then status 200
  * print userAccountsSchema 
  And match response == userAccountsSchema

But the schema I posted here is simplified to ask this question, the real schema is far more complex. So for clarity purpose, I decided to put schema in a separate js file response-schemas.js under the same folder as the feature file.

Here is the simplified content of response-schemas.js file.

function schema () {
    let accountSchema = {

       id: '#number? _ >= 0',
       prop1: '#number? _ >= 0',

       prop2: '#string',
       prop3: '#string',
     
      optionaProp: '##string',
    }'

    return {
            accounts: `#[] ${accountSchema}` ,
            prop5: '#string',
            prop6: '#string',
    };
}

now if I replace the 2 lines I mentioned at the beginning of the question under Background:, with below line

 * def userAccountsSchema = call read('response-schemas.js')

I get this error

And match response == schemas
SyntaxError: Unnamed:1:8 Expected comma but found ident
[object Object]
        ^

I believe, I understand the problem, is this line

 accounts: `#[] ${accountSchema}` ,

but unable to figure out the solution. If I tried to change the accountSchema variable in response-schemas.js to use multiline string then I get error in read step in Background

the whole idea to have a dedicated js file for schema is to keep it readable (by using multiple lines, preferably objects not a long string)