These methods will not be added.
The only purpose of these methods in B4A was to allow developers to iterate over the Map items. This was before the For Each loop was available.
A standard Map structure doesn't support these methods so adding them requires a more complicated (and less optimized) structure.
For Each k As String In Map.Keys
Dim v As Object = Map.Get(k)
...
Next
This code is faster and doesn't require a custom structure under the hood.