Chop 28 g bittersweet chocolate into small pieces, about the size of chocolate chips.
I don't recommend using chocolate chips since they're designed to hold their shape under high heat. They take longer to melt, and they can burn in that time.
Microwave in 15-second increments, stirring between, until fully melted. Alternatively, heat the chocolate over a double-boiler until melted.
Optionally, stir in 1 g neutral oil to get the chocolate to a drizzling consistency.
With your compressor dasher spinning, drizzle in the chocolate in the last 2-3 minutes of churning. It will break up into small, thin shards.
Video
Notes
Yield: This makes enough stracciatella to accompany one full ice cream recipe (usually 2-3 pints)
Use a high-quality chocolate you like the taste of. I find Ghirardelli 60% baking chocolate works well here and is relatively inexpensive.
I prefer coconut oil, but I have also used avocado oil successfully. Canola or grapeseed oil would work as well, but skip olive oil unless you want that flavor.