Using Build Variables in debug Initialization Commands
I thought that all those functionalities be already available from the out of box software SW4ST32.
If you have biuld success, you should have an elf file available.
From the pane of C/C++ Projects, under your project, expend Banaries, there you should see the elf file generated for your project. Select it by click, then go pull down Menu of Run, chose Debug Configuration, chose Ac6 STM32 Debugging, and the elf file below it, find the Debub button at right low coner.
You should be all fine from there.
There may other way work also, by right click the elf file under C/C++ Projects, chose "Debug As" -> Ac6 STM32 C/C++ Apllication, this could be also working fine.