Cannot build Android APK when using the subdirs template

I'm trying to build the project which includes an external library (that's why subdirs template is used). On Linux platform all is OK, but when I try to build Android APK the following error is occured:

No application .pro file found, not building an APK.

After googling the issue, I had found two possible reasons of the problem:
1. There is no *.pro file by the expected path.
2. There is no *.json file by the expected path.

Then I tried to manually run the androiddeployqt command (the make command finished normally, and the android-build folder already exists):

/opt/Qt/5.10.1/android_armv7/bin/androiddeployqt --input ./myproject/android-libmyproject.so-deployment-settings.json --output android-build --deployment bundled --android-platform android-25 --jdk /usr/lib/jvm/java-8-openjdk --gradle

 The build was completed successfully and the external library was bundled into the APK.