aioble 'BLE' object has no attribute 'l2cap_connect' on Pico-W

I'm trying to run the l2cap_file_client.py and l2cap_file_server.py examples from https://github.com/micropython/micropython-lib/tree/master/micropython/bluetooth/aioble on my Pico-W. I'm currently running MicroPython v1.22.0-preview.236.ge1a7aa23f on 2023-12-09; Raspberry Pi Pico W with RP2040

It sounds like the BLE support for the Pico-W is missing l2cap functionality, I get stack traces like:

...
Connecting to Device(ADDR_PUBLIC, d8:3a:dd:94:88:0e)
Discovering...
Connecting channel
Task exception wasn't retrieved
future: <Task> coro= <generator object 'getPrefsFromServer' at 20012c60>
Traceback (most recent call last):
  File "asyncio/core.py", line 1, in run_until_complete
  File "l2cap_file_client.py", line 152, in getPrefsFromServer
  File "l2cap_file_client.py", line 62, in connect
  File "aioble/device.py", line 288, in l2cap_connect
  File "aioble/l2cap.py", line 205, in connect
AttributeError: 'BLE' object has no attribute 'l2cap_connect'

What can I do to get this working? More documentation about what is/isn't supported on a given platform would be really helpful as I just blew an afternoon getting to this point. Seems to be a bit of a theme, see https://github.com/micropython/micropython-lib/issues/444 and https://github.com/micropython/micropython-lib/issues/686

Beginne mit den Beispielen l2cap_file_client.py und l2cap_file_server.py und verfolge dann aioble/device.py und aioble/l2cap.py bis zum fehlschlagenden Aufruf von l2cap_connect. Prüfe die Pico-W-BLE-Implementierung, um festzustellen, ob L2CAP auf dieser Plattform unterstützt wird. Unter „Done“ sollte die Plattformunterstützung und der verfügbare Weg zum Ausführen dieser Beispiele dokumentiert werden oder der Umfang der fehlenden Implementierung angegeben werden.