@Deac Thank you for reaching out!
Yes, this can be done by doing the following:
Long press on the watch face, then tap the ‘Customize’ button that appears at the bottom of the watch screen
Using the digital crown, scroll through the complications until you get to Evernote
Please know, there is a known issue that is preventing the Evernote complication from working on the series 4 watches. It is something we're working to address, and I'll provide an update once it has been resolved.