Circular reference in subquery

Have table messages with following columns:
id
, body and parent_id (ref to parent message from the same table). Now select all messages and for each messages return also count of messages that have this message's
id
as parent_id. The SQL query is roughly:
SELECT 
    m.id,
    m.parent_id,
    m.body,
    (SELECT COUNT(*) FROM messages m2 WHERE m2.parent_id = m.id) AS child_count
FROM 
    messages m;

Is it possible to rewrite it to Drizzle query? Something like:
db.select({..., repliesCount: ???)}).from(messages)
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