How to convert a DER-formatted signature back to a Signature object?

[fauxbytes]

Given:

let sig = ecKey.sign(msg);
let sigDerHex = sig.toDER('hex');

Is there a way to rehydrate sigDerHex back to a Signature Object?

Many thanks!

[no-longer-human]

Project looks dead. The Signature constructor is capable of performing the conversion, but this has not been exposed for some reason.