[exim] exim command to generate maildirsize file?

I have

transport = local_maildirsize_delivery

in my router which enables exim to create/read/update a maildirsize file in each user's mailbox when it delivers a message to maintain user quota information.

I believe that exim periodically recreates the maildirsize file. It also creates a new one if it doesnt exist when delivering a message. Is there a command to tell exim to create (or recreate) such a file immediately, if I pass it the mail directory as an argument?

Thanks,

Oliver
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