C++ :: Initializing Const Struct When Data Is A String Literal

I have a struct like this:

Code:
struct String{
char* data;
std::size_t size;
};

I would like to be able to create const variables of this type for string literals.

Code:
const String message;

Is there an elegant way to create a const String like this when data is a string literal?

I tried this:

Code:
const char *string_data = "Hello";
size_t string_size = strlen(string_data) + 1;
const String string = {string_data, string_size};

The problem with that is that string.data isn't considered const during the initialization of the String struct so the compiler throws an error. It doesn't feel very elegant to do it like this either way.

Is there an elegant solution to this problem? I would like to avoid making a copy of the string literal.