alternate for proto_tree_add_text()

proto_tree_add_text(header_tree, tvb, startValue, 3, "%s: %d", val_to_str(Tag, value_string_array, "Unknown Tag:(0x%02x)"),value);

the convert_proto_tree_add_text.pl isn't considering the "%s: and %d"

it is only considering %s: and the result is invalid!

i need the alternate for the same function using proto_tree_add_item()

Thanks in advance