Support for vector of structs?

[jmafc]

I'm trying out inja on something akin to a blog where you may find something like the following (in Python):

posts = [{'id': 1, 'title': 'First', 'body': 'This is one'}, {'id': 2, 'title': 'Second', 'body': 'This is another'}, {'id': 3, 'title': 'Third', 'body': 'One more'}]

I haven't tried it with Jinja2, but I believe this is handled fine, and also even if the items were constructed using a Python class rather than hard-coded dicts.
In C++ the obvious analog is to define a std::vector<Post>, with Post being a struct with the expected data members.
However, if define a json data variable and then try to assign the posts vector, i.e.,

json data;
data["posts"] = posts;

the compiler complains that no known conversion for argument 1 from ‘std::vector<Post>’ to ‘nlohmann::json_abi_v3_11_3::basic_json<>’.
Is there a simple way to accomplish this? If this isn't quite as easy, would a loop through the posts to fill out each known member, e.g., data[i]["title"] = posts[i].title; be possible, and if so, how can inja deal with it in a template for loop, i.e., one that does for post in posts?