code link for legency C++ code using drawio

[laohuang114]

I have a legency C++ project and have to understand all the details, I would like to develop flowchart to help to understand the code, while I found only the node in draw.io which is named after the keyword of class name can linked to the code, is there a method to link several lines of code to a node? (I can only add comment line for this code, eg. I add specific keyword in the comment line, and drawio can identify the keyword)