Stroller Run added difficulty not calculated

Is there a way to add pushing a stroller when starting a run? I know it makes a run waaay harder. My heart rate increases big time on these runs but my watch tells me my fitness is declining because I’m going slower. But it’s due to the fact that I’m pushing a double stroller that weighs around 100 lbs with kids in it for 6 miles. The stroller runner community is huge and this would be an amazing perk to the app!