The USVI has introduced a digital vaccine pass. You will be able to upload the pass to the travel portal. The expectation is that this pass will be used for entry to the USVI once the travel protocol is changed to allow vaccinated people to travel without a COVID test. We went ahead and got ours. You upload your proof of vaccination and they send you a scannable document and a pass that can be downloaded to your Apple or Google wallet.

https://www.covid19.usvi.care/polariskey

Cheers, RickG