Capture Acreage info for listing

We price our drone services based on acreage so we need to be able to capture the property’s acreage in the listing info, similar to square footage. We have tried some work-arounds including building Questions that add $ and time, but these solutions are not clean as the added costs are not reflected in the bundle price on the order summary page. It is buried in the questions. Can we capture (optionally) the acreage, then make it a required field when drone services are ordered? Many thanks.