I never had to deal with it, and I don't use Lacerte, but it sounds like you enter it as a regular W-2, BUT make some adjustments.  This article seems to walk you through it:

https://lawblog.vilaw.com/2010/01/articles/tax-estate-planning/preparing-an-individual-income-tax-re...

But again, I don't use Lacerte, so perhaps Lacerte has a mechanism built-in to it.

Agree, same way you do with a W-2.  See also a not too distant discussion on USVI reporting:

https://proconnect.intuit.com/community/proseries-tax-discussions/discussion/income-earned-in-st-tho...