Please add support for the following use and may be other usable sieve extensions:

"Move the mail to a folder and if this folder, including subfolders, does not exist, create it (them) first."

a) new tag :create for the action/extension fileinto
b) the date extension - RFC5260
c) the variables extension - RFC5229

To allow filtering like this - https://doc.dovecot.org/configuration_manual/sieve/examples/#archiving-a-mailinglist-by-date