Roll-up Subitems to en EXISTING collumn>

Is there a way to rill-up a subitem summary to an EXISTING parent column?
I do not want to create a new column for this info.

eg; I have a column labeled “Current Spend” in my Job Tracking Board. Occasionally my jobs have Subitems (which, I didn’t discover until after I had built the board). I’d like the “Current Spend” subitem columns to sum-up to the existing “Current Spend” column in the parent item.
I’ve noticed a 3rd party app from Excellent Team called Rollup Subitems, from a discussing back in 2022. But I still don’t see the app on the Monday.com Marketplace.
Any help would be greatly appreciated.
Thanks!

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