is it possible to use __declspec(dllexport), when data type of variable is not known to us?

include <Windows.h>
#include <stdio.h>
#include <string.h>
#ifdef __cplusplus
extern "c" {
    #endif
    __declspec(dllexport)char abc;
    __declspec(dllexport)char hello;
#ifdef __cplusplus
}
#endif

int main (void) {
    HMODULE hMod;
    int *pGlobal,i,pG;
    BOOL fFreeResult;
   
    char d[]="abc";
    char g[]="hello";
 for(i=0;i<5;i++)
 {
   hMod = GetModuleHandle (NULL);
 pGlobal = (int*)GetProcAddress (hMod, d);
        fFreeResult = FreeLibrary(hMod);
        hMod = GetModuleHandle (NULL);
 pG = (int*)GetProcAddress (hMod, g);
    printf("%u\t%u\n",pGlobal,pG);
}
    return 0;
}