Yes you can! Pearler now offers digital joint accounts. Simply follow this link to get started: https://secure.pearler.com/onboarding
When you click it, it should take you to the page below. Click the two red circles.
Once that's done you'll be taken to the Joint Application step. If you have an individual account open already your details should be saved. You then need to complete your co-holder's details.
Once that's done you should be right to go.
To be clear - you are able to have an Individual & Joint account at the same time on Pearler, including managing your portfolios and automatic investments separately. To switch between them once they're opened just go to "Settings" and then "Accounts".