OpenTSDB and Annotations

Hi!

I’m looking for a way to perform queries on annotations using OpenTSDB as our database.
The way we add our annotations is something like :
[{ "startTime": "1505222942", "description": "MAINTENANCE_HOST", "note": "lorem ipsum", "custom": { "host": "SLMUPAZABX01", "source": "zabbix", "desc": "MAINTENANCE_HOST sur le serveur zabx 01", "name": "toto" } }]

How should we use filter and how can we exploit the “custom” field(s) ?

Best regards,

Léo PARIS.

Did you ever find a way to accomplish this?