Programmatically get function signature or annotation from Python side.

[pogmat]

Once I "register" a function in the module I would like, from the Python side, to programmatically retrieve somehow the signature of the funcition (even via annotations).

I'll illustrate a MWE.
My C++-side code is:

#include <pybind11/pybind11.h>
namespace py = pybind11;

PYBIND11_MODULE(example, m) {
    auto func = m.def(
        "my_func",
        [](int a, float b) {
            return a + (int)b;
        },
        py::arg("a"),
        py::arg("b")
    );
}

From the Python side, the only useful attribute I see is __doc__ which actually contains the signature, strigified

'my_func(a: typing.SupportsInt, b: typing.SupportsFloat) -> int\n'

Now, a solution would be to parse this string. But since this string is generated inside pybind11, I was wandering if one can somehow retrieve this information directly from the C++ side and set in a convenient attribute or global object of the module.