How can you shorten a line and make it universal by specifying the relative path to the include'am in the .pro file. test_agent is the name / folder of the project
include(C:\Users\user\Desktop\test_agent\qtservice\src\qtservice.pri) that is, I need to replace C: \ Users \ user \ Desktop \ with an analogue of pwd in * unix
$$PWD? doc.qt.io/qt-5/qmake-variable-reference.html#pwd - user194374