public int getForwarderChain() {
        return forwarderChain;
    }
This field relates to forwarding. 
Forwarding involves one DLL sending on 
references to one of its functions to 
another DLL. For example, in Windows NT, 
NTDLL.DLL appears to forward some of its 
exported functions to KERNEL32.DLL. An 
application may think it's calling a function 
in NTDLL.DLL, but it actually ends up calling 
into KERNEL32.DLL. This field contains an index 
into FirstThunk array (described momentarily). 
The function indexed by this field will be 
forwarded to another DLL. Unfortunately, the 
format of how a function is forwarded isn't 
documented, and examples of forwarded functions 
are hard to find. 
@return the forwarder chain
Ghidra/Features/Base/src/main/java/ghidra/app/util/bin/format/pe/ImportDescriptor.java