Basic 10 lines type reflection implementation in C (see another gist if you need reflection for functions)

c_reflection.c

#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <stdint.h>

// Lib code

char* ___tid(const char* strPtr) { return (char*)strPtr; }
#define TID(type) ((intptr_t)___tid(#type))

#define FIELD(type, field, fieldType) operation->operation(operation->context, operation->data + offsetof(type, field), #field, TID(fieldType))

typedef struct
{
    void* data;
    void* context;
    void (*operation)(void*, void*, const char*, intptr_t);
} Operation;

// Usage

typedef struct 
{
    int i;
    int j;
} Test;

void Test_ref(Operation* operation)
{
    FIELD(Test, i, int);
    FIELD(Test, j, int);
}

void int_ref(Operation* operation)
{
    // ImGUI / Serialization / Desirialization here
    printf("%d\n", *(int*)operation->data);
}

void toStr(void* context, void* val, const char* name, intptr_t typeId)
{
    Operation operation = { .data = val, .operation = toStr, .context = context };
    // Use dictionary here, put dictionary to context
    if (typeId == TID(int))
    {
        printf("%s = ", name);
        int_ref(&operation);
    }
    if (typeId == TID(Test))
    {
        printf("Test\n");
        Test_ref(&operation);
    }
}

int main(void)
{
    Test test = { .i = 10, .j = 20 };
    toStr(NULL, &test, "test", TID(Test));
    return EXIT_SUCCESS;
}