Using the Marker field on discounts

I am trying to figure out how we can use the new (Litium 8) Marker fields on campaigns. From what I understand it is meant to display campaign info such as “Buy 4 get one for free” on the product page/in lists. Found this thread with some info on the topic. I am able to fetch all lists in which the product is, but I am not able to find all discounts based on that list.

I think it could be solved by looping through all discounts and finding those that are active and of correct type (Buy x products, get discount on the cheapest and Mix and match). This would require a method that allows me to get all discounts at once, which I am unable to find.

Am I missing something here, or is this just not implemented in Litium yet?

Litium version: 8.15.5

Dataservice can be used to fetch all the discounts