Configurable List: Request to be able to get calculation values from the widget fields

It would be great if we could add up the values entered in the number field into another form element. Right now, it adds the date and the number field together.

I am afraid that this is not possible at the moment. I have added a feature request ticket to our system about the configurable list calculation values, to see if this is something that can be implemented at some point. We will let you know if we have any updates on this.

Is there a comparable widget that would allow users to add rows and also calculate sums for certain fields?

Unfortunately, I am not able to find any widget that is allowing calculations with dynamic rows. At this moment, it is only possible to use multiple Short text entry/number fields to hide them by conditions and perform a calculation using a Form calculation widget.