Missing feature: Sign VPAProject for word documents

I am missing the feature to digitally sign word macro vbaprojects in .docm files.
It exists for excel files:
Sign
Sign this VBA project by a DigitalSignature

@nni,
Thanks for your inquiry. Please use DigitalSignatureUtil.Sign method to sign source document using given CertificateHolder with digital signature and writes signed document to destination file.