How to import lots of macros from a library?

[Asperamanca]

How would I import dozens, probably even hundreds of C/C++ macros defined within a library into EA?

In the "Language Macros" dialog, you seem only to be able to define which macros exist, not what they contain (EA's "Help" in this case instructs to "Enter details for your macro", but not where or how to do that - there's no obvious place like a text box where to paste the content of the macro).

Besides, doing that with hundreds of macros (each time manually searching through foreign sources to find the macro definition) would take several days of very error-prone work.

Is there no way to instruct the code parser to look for and add macro definitions found within the source files? Or is there any other, workable way to include macros?