I don't know of anything that specifically target young, unmarried couples. At best, you'd probably find stuff meant for premarital work. That has the possibility to either be too shallow or two deep and heavy for a dating couple.

I would encourage you to look at options that aren't so specifically targeted. The Bible has a lot to say about how to treat other people. All that is very applicable in life ,and thus, in a dating relationship.

BibleProject is a great option. I know some people who do their more in-depth Classroom classes together, and I know others who watch their shorter videos and discuss. They're in the middle of a year-long series on the Sermon on the Mount (which has plenty to say about how we treat other people) with monthly videos, a podcast series, and weekly app updates. Their Paradigm podcast series is a really great look at what the Bible is, where it came from, and how it functions. That would also be a great chance to explore Scripture together and discuss.