Functions in C++ file

My main function (e.g. foo() ) is in a C++ file (*.cpp). It calls other functions (bar1, bar2, bar3) in *.c files.

The "VSCode-C-Call-Hierarchy" is able to find the call relations between bar1, bar2, and bar3. But it doesn't recognize that foo() is calling bar.

I know this addon is for C files. So is the behavior of not recognizing *.cpp files expected?

Is there any way to enable CPP call hierarchy? Thank you.