How to rescue brisket in slow cooker?!

[SevenKingsMustDie]

I left 2 x 1kg pieces of brisket in the slow cooker on low for eight hours today and went out.

The sc turned off after that time and when I got home, discovered it is still not tender!

Was going to 'pull' it to make chilli tomorrow but don't think it will work now!

Any ideas how I can rescue it? I don't want lumps of tough beef in my lovely chilli!!!! 😩 🙏🏻

Has it tenderised at all? I'd probably leave on low overnight with a tin of chopped tomatoes for liquid or a bit of beef stock so it doesn't dry out.