The old form block has an event we can use to run custom actions whenever something is submittedhttps://github.com/concrete5/concrete5/blob/develop/concrete/blocks/...

In the new form block there's no event, but there's a ton of undocumented code I'm not sure how to use best. We have this notification manager:https://github.com/concrete5/concrete5/blob/develop/concrete/blocks/...

Gets two notification from this method:
https://github.com/concrete5/concrete5/blob/develop/concrete/blocks/...

This then uses a notification manager that has a driver concept:
https://github.com/concrete5/concrete5/blob/develop/concrete/src/Exp...

That's all nice, but I haven't found any kind of information on google, here. Can anyone enlighten me and tell me that idea on how to extend these things? I'd be more than happy if there's an example. Some documentation regarding express would also help, but without any kind of information I'm a bit lost.