ESOUI - Getting slotId from slotNum in Quick Slot Bar

I am looking for a way to get the bag slotId from ZO_QuickslotRadialManager in order to access the right item.

When more than one level of the same Item is present in BAG_BACKPACK, this slotId would make the difference in the following code:

Code:

function get_slotId_itemLevel(slotId)

    local  data  = SHARED_INVENTORY.bagCache[BAG_BACKPACK][slotId]

    if(    data == nil) then return nil end

    return data.requiredLevel

end

From where I stand, I could not find a way to get this slotId from ZO_QuickslotRadialManager.

These are the functions I know of:

Code:

GetCurrentQuickslot()

GetItemName        (BAG_BACKPACK, slotId) (the BAG_BACKPACK index)  

GetSlotItemCount  ( slotIndex )          (the quick slot bar index)

GetSlotName        ( slotIndex )          (the quick slot bar index)

GetSlotTexture    ( slotIndex )          (the quick slot bar index)