Unfortunately you can't - Blizzard broke the workaround we Workshoppers used to forcefully enable support for Workshop in Stadium, in either the mid-season patch or one of the smaller patches after that. Hopefully the devs manage to fix it in S19 in a few days. Just in case I've updated the description with the information about this.

Technically it's doable, but only by adding 43 switches (one switch per hero) under Workshop Settings 😅
So if you don't mind toggling god knows how many switches every time you import the code, I'm down to add these settings.

They were slated to release a quick play version this season but it got pushed back to season 18, it was going to be 5 potential rounds as well, it also says unranked at top.

dark magic 🧙‍♂️

in all seriousness enable stadium; paste some random settings and then you'll be able to access the workshop;

you can also use code 2zczx

Unfortunately, no. Even changing how they "think" and forcing them to go to point isn't possible with Workshop because AI bots have minds of their own. Technically there shouldn't even be a possibility to add them to Stadium custom games (if you enable the Stadium checkbox in lobby, the Add AI button disappears), and honestly I'm surprised they even spawn at all 😅

You can either import the code 2zczx or you can import this text into workshop

settings
{
    lobby
    {
        Return To Lobby: Never
    }

    modes
    {
        Clash

        Control

    }
}