Specialist Arcana

I have at various times asked the casters in the party to roll Arcana but use their spellcasting ability (representing their connection to magic, instead of the Intelligence of their book-learning on magic). DnDBeyond isn't great for rolling on non-default ability scores. So now there's a skill on their sheets that does that calculation for them, near the bottom of the list: Arcana (Divine/Natural/Sorcerous).
This is not intended as a straight up replacement of the Arcana skill, as it is only applicable in situations where the caster has more or less direct experience of the magic at work. Usually this means direct contact (the spell is cast directly on them) but it can also be used on something that gives off an aura.