Fuel calculation ub SD already has several items. We recently discussed the misleading "Reserve"-item which in fact means "Fuel to alternate".
In addition, I suggest to put more Information in the fuel calculation Segment - in SD itself and the printable flight log also.
The prototype is the german LBA VFR flight planning form.
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For those not familiar with german names:
Reiseflug                           cruise (time and fuel needed)
Steigflug                           Climb‌‌‌
Zuschläge                        Addons ....
Anlassen und Rollen      ... Startup andTaxi
An- und Abflug               ... Departure and Arrival
Ausweichflugplatz           Alternate
Reserve                          Contingency
Mindest-Kraftstoffbedarf      Fuel needed
Extra Kraftstoff                    Excess fuel (?)
Kraftstoff-Vorrat                   Fuel on board (Calculates Maximum Flight Time)
Sichere Flugzeit                   Safe Flight-Time                 Max Flight Time minus 30m‌in.

The middle column is always time (hh:mm), right column is Fuel in ltrs/gals‌‌
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You might find more people will comment on your suggestion if you say why you think it's necessary or helpful to have so many extra lines in the fuel calculation.

I'd certainly argue for fewer lines in the fuel estimator. For example, why are taxi, takeoff and landing separate numbers? They are all simply fixed quantity allowances which are added together. The other fields do make sense: cruise and diversion are based on planned distance/time, holding is a time-based allowance, and contingency is a percentage addition.

Adding‌‌ any more detail runs the risk (IMO) of giving a false impression of accuracy.