Character Sheet Caster Vs Class

Hey folks, how are spells associated with a class? I know the Class above circled in red at the top of the screenshot circled in red like back to one of the 3 possible classes at the top of the page. If I am hauling out stuff like:                 rowIds.forEach(id => { let spellID = id; let spellName = getAttrByName( CharID, `repeating_spells_${id}_spell_name` ) || ""; //log(spellName); let spellCaster = getAttrByName( CharID, `repeating_spells_${id}_spell_caster_class` ) || 0; let spellLev = getAttrByName( CharID, `repeating_spells_${id}_spell_level` ) || "0"; spellLev = parseInt(spellLev, 10) || 0; //0 to 9 with 0 being cantrips etc, etc I can get repeating_spells_${id}_spell_caster_classwhich is that Castor 1 , for example: Zeffiro Zirconyd spells: Caster 1 Level 1 Detect Invisibility Caster 1 Level 1 Light Caster 1 Level 1 Phantasmal Force Caster 1 Level 1 Colour Spray Caster 1 Level 1 Wall of Fog I'm trying to figure out, is how does Caster 1 links to, in this case, illusionist? Or does it? Thanks. 

The sheet expects the sheet user to choose which class is associated with Caster1 and Caster2 (if appliciable).  A sheetworker is used to display a class name with a spell based off of the sheet user's choice.  You would probably need to come up with similar logic in your API mod if you're after something similar.