Expiry Date on Ads - Is that possible?

Hi,

I'd like to place multiple "in post ads" to our site. But we don't see an expiry section that we can select a date for the ads to stop appearing. That would be an amazing feature so we don't have to manually turn them off (most of our "ads" are for events)

Is there a work around for us to create this "expiry" date for the ads?