How to show multiple values of an array at a time without using dbms_output.put_line in PL/SQL

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SQL

I have an array which has dynamic index size. i want to show all the array values at a time within the exception message like,

RAISE_APPLICATION_ERROR(-20010,'The Requirement index for item '|| 
                            (Here should be present all the array value) ||
                            ' needs to be in Approved status.');

statement.

Could anyone please help me out from this.

Advanced thanks to whom solved this issue.