tl;dr. Check out http://davidjsa.com.
Long version: I’ve moved my blog over to Ghost. However, exporting from WordPress to Ghost is apparently a nightmare as of 2019. Ghost development is moving quickly, and the two platforms just don’t offer the same functionality. So there’s no easy way to do it.
I even started trying to manually copy my posts one-by-one. Until I found out that, in order to back date posts, you have to use the datepicker they include, which only lets you move back in time in one month increments. So I’d be clicking a left-arrow 100-plus times in order to migrate just ONE POST from the late 2000’s.