I got resolution,
vc_map( array(
"name" => __( "xxxxxx" ),
"base" => "xxxxx",
"icon" => plugins_url('img/vc-icon.png', __FILE__),
'description' => __( 'xxxxxxxx', 'xxxxxxxxxx' ),
"params" => array(
array(
'type' => 'dropdown',
'heading' => __( 'Select xxxxxx', 'xxxxxxxxxx' ),
'param_name' => 'id',
'admin_label' => true,
'value' => $xxxxcvx
),
),
) );
I implemented 'admin_label' => true,
and then it’s working fine….