It was already added
Okay, just tested this and you actually can't! Apparently it's been like that since the polishing update lol. It still tells you to take the girl to a Day trip in order to ask her to marry you which is kind of impossible due to heavy circumstances (herself).
Other thing I noticed was that in the facility, sometimes when using the special formula and the concentrate on a girl, the percentage needed to get to the next stage get stuck at 100% until you do a feeding, sometimes it accumulates a few stages too, forcing you to do a few hose feedings in order to keep going. I think that would be all I've noticed for now.