[Python] How to include a .aar file in a Kivy/Buildozer Android project

I would like to add a .aar file (onnxruntime.aar) to my Kivy project. My project structure is:

├── buildozer.spec
├── dress.jpg
├── libs
│ └── onnxruntime.aar
├── log.txt
├── main.py
├── __pycache__
│ ├── temp3.cpython-310.pyc
│ ├── temp3.cpython-39.pyc
│ ├── tflite_models2.cpython-310.pyc
│ ├── tflite_models2.cpython-39.pyc
│ └── tflite_models.cpython-39.pyc
├── temp3.py
└── tflite_models2.py


In my buildozer.spec, I have:

[app]

# (str) Title of your application
title = Test_onnx_image

# (str) Package name
package.name = test_onnx

# (str) Package domain (needed for android/ios packaging)
package.domain = org.test

# (str) Source code where the main.py live
source.dir = .

# (list) Source files to include (let empty to include all the files)
source.include_exts = py,png,jpg,kv,atlas,aar

# (list) Application requirements
# comma separated e.g. requirements = sqlite3,kivy
requirements = python3,kivy==2.3.1,numpy,filetype,plyer,pillow,pyjnius
android.requirements.source.pyjnius = https://github.com/kivy/pyjnius/archive/refs/heads/master.zip

# (list) Android AAR archives to add (currently works only with sdl2_gradle
# bootstrap)
android.add_aars = android.add_aars = libs/onnxruntime.aar


But When I try to build the .APK:

buildozer -v android debug
​

i get the following error:

[INFO]: Detected highest available build tools version to be 36.1.0
[DEBUG]: -> running gradlew clean assembleDebug
[DEBUG]: > Task :checkDebugAarMetadata FAILED
[DEBUG]:
[DEBUG]: FAILURE: Build failed with an exception.
[DEBUG]:
[DEBUG]: * What went wrong:
[DEBUG]: Execution failed for task ':checkDebugAarMetadata'.
[DEBUG]: > Could not resolve all files for configuration':debugRuntimeClasspath'.
[DEBUG]: > Could not find nnxruntime:.
[DEBUG]: Required by:
[DEBUG]: project :
[DEBUG]:
[DEBUG]: * Try:
[DEBUG]: > Run with --stacktrace option to get the stack trace.
[DEBUG]: > Run with --info or --debug option to get more log output.
[DEBUG]: > Run with --scan to get full insights.
[DEBUG]:
[DEBUG]: * Get more help at https://help.gradle.org/
[DEBUG]:
[DEBUG]: Deprecated Gradle features were used in this build, making it incompatible with Gradle 9.0.
[DEBUG]:
[DEBUG]: You can use '--warning-mode all' to show the individual deprecation warnings and determine if they come from your own scripts or plugins.
[DEBUG]:
[DEBUG]: See https://docs.gradle.org/8.0.2/userguide/command_line_interface.html#sec:command_line_warnings


what am i doing wrong?

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