PlayStation [HELP] Local Splitscreen and Online Play

[Rice19]

I'm trying to set up a local co-op session and have another couple join in an online session (who are also doing a local co-op session). Does anyone know how to do this? The thread below seems to imply that we should be able to do this.

https://www.reddit.com/r/StardewValley/comments/lhx0ww/stardew_valley_15_released_on_console_and_pc/