#include <Arduino.h>
 
 typedef struct{ 

    uint16_t   in_min; 
    uint16_t   neutral; 
    uint16_t   in_max;  

  } configType;

configType cfg = { 1,2,3};


  struct m_item {

    void* valueRef;
    const uint8_t val;

  };

m_item menu = {&cfg,127}; 


void setup(){

configType * cfgPointer = (configType*)menu.valueRef;

  Serial.begin(115200);
  Serial.println(cfgPointer->neutral);
}

void loop() {

  delay(10); // 
}