glz::meta not supported for enum flags?

[powerof3]

#include <iostream>
#include "glaze/glaze.hpp"

enum class MyEnum {
    X = 1 << 0, 
    Y = 1 << 1, 
    Z = 1 << 2
};

MyEnum operator|(MyEnum  a, MyEnum  b)
{
    return static_cast<MyEnum>(static_cast<int>(a) | static_cast<int>(b));
}

template<>
struct glz::meta<MyEnum> {
	using enum MyEnum;
	static constexpr auto value = enumerate(X, Y, Z);
};

struct my_struct {

    MyEnum flags{ MyEnum::X | MyEnum::Z };
};

int main() {
    my_struct obj{};

    std::cout << glz::write_json(obj).value_or("error") << '\n';
    return 0;
}

This displays as {"flags":5} instead of the expected string value (eg. {"flags": "X | Z"})