[Improvement]: Ability to call a function with parameters from the LHS and assign the return value to a RHS field

[chathurace]

Description

Let's say that we have get a message m1 of the below type:

type Person record {|
   string name;
   string country;
   record {| string street; string city; |} address;
|};

Now we want to transform this to an instance m2 of the below type:

type Employee {|
   string name;
   string address;
   string countryCode;
|}

So the transformation would be:

function transform(Person person) returns Employee => {
    name: person.name,
    countryCode: lookupCountryCode(person.country),
    address: constructAddress(person.address.street, person.address.city)
};

However, it is not possible to create this transformation using the data mapper as function calls with parameters from left hand side fields are not supported.

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[madushajg]

I was able to achieve the above requirement in plugin v4.1.0 and Ballerina 2201.5.0 as below.

@chathurace hope this addresses your requirement.