I mean, this is what I pretty much did upon returning from my maternity leaves but I would never put it into an email! My maternity leave OOO was the vague “I am on extended leave and am not anticipated to return until X. Please contact Joe or Fergus in my absence.” X being a vague time-frame based on my due date and the length of my leave. No one is waiting 3+ months for an answer so I did get to delete most of the 500 emails I got during my most recent leave! I did once have someone internal tell me I should say maternity leave rather than leave, but really, what does it matter? I’m gone for a few months and no one outside of the company really NEEDS to know why.
My mom works part time at a library in archives, where her personal work email is also the general archives email (ie LibraryNameArchives @ email . com). She has an out of office response that replies with her work hours (since she’s the only employee in the archives) so people know when she’s in the library and can respond or when they can come in and visit her. The only frustrating thing is that her email either isn’t capable of, or she doesn’t know how to, turn off the OOO email when she’s actually in the office, or doesn’t trust that she’ll remember to turn it back on. She’ll send me an email about something, I’ll respond, I’ll get an OOO response, she’ll respond, I’ll reply, I get an OOO reply, etc etc.

Hoo boy, have I got some PTSD from Old Job about out of office autoreplies. Exboss was such a stickler for them and actually enforced her expectations as official policy. Meaning if you didn’t do it to her exact specs, she’d call you back to the office to do it (which no one did) and read you the riot act afterwards while threatening to write you up for insubordination. She demanded them any time that we were away from our desk for longer than 30 minutes and for anything other than a meeting. So training in the conference room down the hall, a work lunch with teammates, leaving an hour early for an appointment, arriving late for an appointment, even working from home, all required OOO alerts.
My department still doesn’t allow us to send OOO auto-replies to external recipients because of one incident years ago (a customer tried to contact a sales rep about an urgent order, got the rep’s auto-reply, and in their ensuing panic, somehow got escalated all the way up to the company president). Any external emails we get are auto-forwarded to a centralized mailbox and (ostensibly) handled by another rep while we are out. It bothers me to know that my external contacts won’t get a reponse from me while I’m out and may think I’m just ignoring them.