Body size limitation for webhook in watcher

I have seen a similar request in the forum but without answers so I try my luck:

Where can we found the size limitation of the body in the Webhook action of a watcher. I noticed that it seems 1900 char or so on our instance (7.13.4) but I wonder if it's a fixed limitation or if it can be setup somewhere.
Our watcher does a webhook call to create multiple watcher, but the watcher we create have more than 25 000 char (filters + email body in html + attachments). There is no way we could create such watcher with so "few" chars allowed.

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