python-asyncua get monitored items for subscription

[iamthebull]

when using python-opcua - Client class I could read the _monitored_items_map attribute from the subscription object to get a list of the monitored items in that subscription:

items = sub._monitoreditems_map

in python-asyncua the subscription object doesn't have the _monitored_items_map attribute. How can I get this information now? Do I need to read it from the server?