Is there a way to mark all voicemails as "Read" at one time?

I am an assistant to someone who currently has about 800 "unread" voicemails in his Zoom voicemail box. Our voicemails also go to our email inboxes, so that's how the person I assist reads/listens to his voicemails. I've logged into the web Zoom app and can see where I can select all voicemails a month at a time, but I can't find any option available to mark everything as "read." I can only find options to delete them all or to mark them all as "unread."

Seems weird that I can easily delete everything, but not just mark everything as "read."

Thank you for any help you can offer!