With the new Java 14 Record functionality, is it possible of creating multiples constructors for the same Record?

With Java 14, records couldn't have multiple constructors (reference: Java 14 - JEP 359: Records (Preview)).

As of Java 15 and 16+, records may have multiple constructors. (see Java 15 - JEP 384: Records (Second Preview) and Java 16 - JEP 395: Records (Final)).

However, every constructor must delegate to the record's canonical constructor which can be explicitly defined or auto-generated.

An example:

public record Person(
    String firstName,
    String lastName
) {
    // Compact canonical constructor:
    public Person {
        // Validations only; fields are assigned automatically.
        Objects.requireNonNull(firstName);
        Objects.requireNonNull(lastName);

        // An explicit fields assignment, like
        //   this.firstName = firstName;
        // would be a syntax error in compact-form canonical constructor
    }

    public Person(String lastName) {
        // Additional constructors MUST delegate to the canonical constructor,
        // either directly:
        this("John", lastName);
    }

    public Person() {
        // ... or indirectly:
        this("Doe");
    }
}

Another example:

public record Person(
    String firstName,
    String lastName
) {
    // Canonical constructor isn't defined in code, 
    // so it is generated implicitly by the compiler.

    public Person(String lastName) {
        // Additional constructors still MUST delegate to the canonical constructor!
        // This works: 
        this("John", lastName);

        // (Re-)Assigning fields here directly would be a compiler error:
        // this.lastName = lastName; // ERROR: Variable 'lastName' might already have been assigned to
    }

    public Person() {
        // Delegates to Person(String), which in turn delegates to the canonical constructor: 
        this("Doe");
    }
}