Are webhooks from LE possible, or is polling the only option for DNS Challenge?

I haven’t been able to find this info online on my own, hence posting the questions here. I understand that when adding a new host to a certificate, one way to get the DNS Challenge parameters is to poll LE periodically. However, polling is grossly inefficient in terms of latency and performance. Is it possible to request a webhook from LE to be notified when the challenge and/or cert is ready? Many thanks!

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