E-mail notification customization (on file/folder updates)

I need to realize the following:

I want to get e-mail notification on every file/folder update (including file deletion, addition, renaming).

But, not as it made in NC18 “by default” - one email message for all updates for chosen period (hour, day). I want to get single email message for every single file update. And also I want file name, update-author username in email message theme.

I see similar functional in Nextcloud Flow, which allows to send notifications in Talk.
I found some information about Flow scripts, but not too much https://docs.nextcloud.com/server/latest/developer_manual/app/flow.html

Maybe someone has solution of similar problem?
Or some more information/examples for Nextcloud Flow scripts.