Nested tables support

If I have simple table like this:

CREATE TABLE test.nested
(
`account` UInt64,
`Orders` Nested(
id UInt64,
order_id String)
)
ENGINE = MergeTree
ORDER BY account

account │ UInt64
Orders.id │ Array(UInt64)
Orders.order_id │ Array(String)

How I can insert data into this table using clickhouse-cpp API? I’m working with Orders.id and Orders.order_id columns as arrays but when method block.AppendColumn called, I’m getting exception:
all columns in block must have same count of rows.

Is there any existing workaround or plans to extend API for nested tables support?