Shadowlands feature, should be doable through API calls.
https://wow.gamepedia.com/Category:API_namespaces/C_Soulbinds
https://wow.gamepedia.com/API_C_Soulbinds.GetConduitCollection
Lower priority than Legendaries.
Need to decide what exactly to track, just the base conduit? All ranks? This can become a nightmare for completionists (or anyone sane).

added