Looking at the proposed native crypto browser support (should arrive in the next year)
We see:
enum NamedCurve {
// NIST recommended curve P-256, also known as secp256r1.
"P-256",
// NIST recommended curve P-384, also known as secp384r1.
"P-384",
// NIST recommended curve P-521, also known as secp521r1.
"P-521"
};
I wonder if we might be able to get bitcoin's curve in there