Issues wrapping ethereum types and deriving scale-codec methods

I'm trying to implement wrapper types for ethereum_types types in order to provide other traits necessary for making my code compatible with https://github.com/sigp/lighthouse dependencies and Substrate. The following snippet demonstrates my intention.

macro_rules! uint_declare_wrapper_and_serde {
    ($name: ident, $len: expr) => {
        #[derive(
            Default, Clone, Copy, Eq, PartialEq, Ord, PartialOrd, Debug, Add, Sub, Mul, Div, Rem,
            AddAssign, SubAssign, MulAssign, DivAssign, RemAssign, Display, From, Into,
            Encode, EncodeLike, Decode, MaxEncodedLen, TypeInfo,
        )]
        // #[cfg_attr(feature = "std", derive(Serialize, Deserialize))]
        pub struct $name(pub ethereum_types::$name);

        impl Encodable for $name {
            fn rlp_append(&self, s: &mut RlpStream) {
                <ethereum_types::$name>::rlp_append(&self.0, s);
            }
        }

        impl Decodable for $name {
            fn decode(rlp: &Rlp) -> Result<Self, RlpDecoderError> {
                Ok($name(<ethereum_types::$name>::rlp_derive(rlp)?))
            }
        }
    };
}

uint_declare_wrapper_and_serde!(U64, 1);
uint_declare_wrapper_and_serde!(U128, 2);
uint_declare_wrapper_and_serde!(U256, 4);

Unfortunately, I keep fighting with the compiler who doesn't think that these types can implement Encode/Decode even though I am importing the package with those features. My TOML is below:

ethereum-types = { version = "0.12.1", features = ["codec", "rlp", "num-traits"], default-features = false }

Errors

error[E0599]: no function or associated item named `max_encoded_len` found for struct `ethereum_types::U64` in the current scope
  --> src/lib.rs:62:30
   |
62 |         pub struct $name(pub ethereum_types::$name);
   |                              ^^^^^^^^^^^^^^ function or associated item not found in `ethereum_types::U64`
...
78 | uint_declare_wrapper_and_serde!(U64, 1);
   | --------------------------------------- in this macro invocation
   |
   = help: items from traits can only be used if the trait is in scope
   = note: this error originates in the macro `uint_declare_wrapper_and_serde` (in Nightly builds, run with -Z macro-backtrace for more info)
help: the following trait is implemented but not in scope; perhaps add a `use` for it:
   |
4  | use parity_scale_codec::max_encoded_len::MaxEncodedLen;
   |

Start with the wrapper macro in src/lib.rs and the ethereum-types dependency features shown in Cargo.toml. Reproduce the compiler errors and inspect how the requested scale-codec traits are exposed for these types. Done means the intended wrappers compile with the required Encode, Decode, and related derives.