Java lacks the expressiveness to make it much better than this. There's a reason almost all the "replacement Java" languages add something to support DSLs, e.g. type safe builders in Kotlin [1]
The kotlin stdlib-adjacent json lib does it like this
buildJsonObject {
putJsonArray("providers") {
add("SUN")
add("SunRsaSign")
add("SunEC")
}
}
That's not the reason. The question was about JSON generation from existing Java types, not about a DSL. Java JSON libraries offer similar conveniences (in fact, you can be much more sophisticated, clear, and convenient than the DSL you've shown), but this particular library, as explicitly described in the JEP, is not intended to be a general-purpose JSON library, of which Java already has several good and popular ones.
That's not what the person I replied to asked at all, arbitrary types weren't mentioned.
They literally asked why they couldn't write JsonObject.of(Map.of(...))
And there's nothing in Java preventing that. In fact, it is trivial to implement that exact API on top of the API proposed in the JEP.