Let's imagine the horrendous studio-mandated Josstice League didn't happen. Let's pretend for a moment that the original cut of Justice League (or perhaps an edited-down, 2 or 3 hour version) was released in theatres, setting up the future of the DCEU franchise.
Following this, the DCEU slate releases both the films we got (with tweaks to better fit into continuity with ZSJL), and others we were supposed to get. TV series on HBO Max also help flesh out the world.