Function kj_runtime_meshes_json 

#[unsafe(no_mangle)]
pub extern "C" fn kj_runtime_meshes_json(
    handle: KjHandle,
    output: *mut u8,
    capacity: usize,
    required: *mut usize,
    error: *mut u8,
    error_capacity: usize,
    error_required: *mut usize,
) -> KjStatus

Serializes all prepared meshes as { "entries": [{ "entity", "topology", "mesh" }] } JSON.