Modify TOC formatting for ePub

Hi, I’m working on a new ebook that uses both chapter numbers and chapter titles (name of the chapter folder). I’m really pleased with the formatting of the auto-generated TOC when I compile to ePub except for one minor detail. The chapter entry uses a hyphen between the chapter number and title:

Chapter 1 - Out, Out Brief Candle

Is there any way to change this to a colon and tweak the spacing?

Chapter 1: Out, Out Brief Candle

I’ve dug all through Scivener 3.0, the manual, and searched online, but can’t seem to find a way to edit how the TOC entries are written. Hoping there is a solution. Thanks!

I think it’s here:

Thanks so much for your assistance!