SWE2019 Renumber Documents Restart at 1 (or 0) for each folder

So I recently upgraded from SWE2016 to 2019. In 2016, when you select a folder to renumber drawings, it would let you pick a number to start at, and an increment value. I used this to set things up in folders so that all 100 series drawings are panel layouts, 200 series are terminal blocks, 300 series are bills of materials, etc..

In 2019, the drawing numbers are based on a formula. Great, I can now use the folder name to auto generate the series, instead of having to do this manually for each folder. Formula: VAL(FOLDER_TAG) + VAL(FILE_ORDERNO)

However, there is no way I've found to have things start from zero (or one) for each individual folder. The FILE_ORDERNO is a "global" variable that will increment across all folders.

So now I get 101, 102, 103, 204, 205, 206, 307, 308, 309; instead of what I want: 101, 102, 103, 201, 202, 203, 301, 302, 303.

Is there some other variable I can use so that the count starts at 1 for each folder?

Thanks.

SolidworksElectrical