thing is theres no base spell. that attack damage is for the default attack made with your weapon, which is always an attack.

spells are skills, and all skills spells and attacks have a little info window like that in the actual skill screen to the right of where you chose the runes for your spell. all the spells get their base damage from the skill itself rather than raw weapon so it would be impossible to actually show those stats in the main panel for spells because how would it know which spell you want the stats for? theyre all gonna be different right? depending on the level of the skill and the runes chosen. those attack details arnt right for your attack skills either because the skills have conversions, damage modifiers, crit/ailment modifiers blah blah.