Yes, it’s easy: place your extension files here:
C:\Program Files (x86)\ExeOutput for PHP 2020\PHPRuntime73\ext
Then, ExeOutput should recognize the PHP extension.
Make sure you use the 7.3 NTS version of the DLL.
Then, right click in the DLL in the PHP Extension list:
Choose “Copy in the Data \ext subfolder”.
Then, place all remaining extension files into the folder “Data\ext” that lies in the same directory as the output EXE file.