Code used : 
my $certificate      = $opts{certificate};
my $private_key      = $opts{'private-key'};
my $intermediate_key = $opts{'intermediate-key'};
$prompt_answers = [
            'Please enter Certificate:.*' => $certificate,
            'Please enter Private Key:.*' => $private_key,
            'Please enter certificates of Certification Authorities.*' =>
                ( defined $intermediate_key ) ? $intermediate_key : 'n',
        ];
This code was effective till the response passed was 'n' for prompt 'Do you want to continue entering root and/or intermediate certificates', but not effective if the intermediate certificate chain is provided.