Custom brace initializer

Let's say I have this struct:

struct MyStruct {
    int field1;
    char *field2;
    MyStruct(int a, char* b): field2(b) {
        field1 = doStuff(a);
    }
    MyStruct(int a): MyStruct(a, nullptr) {}
    ~MyStruct();
}

As far as I know this is not an aggregate as I have some constructors.

What I want to achieve is to use the curly brace initializer in a custom way, which means using a code like this:

MyStruct x = { 1, "string" };

which implicitly calls the proper constructor (the first one in this case).

Is this possible in any way?