Prevention Circuit in GR-PEACH to handle voltage surges

In RZ/A1H Group User Manual, under section '27.7.4 Processing of Analog Input Pin' of 'A/D convertor' it is mentioned that "To prevent damage from voltage surges at the analog input pins (AN0 to AN7), connect an input protection circuit like the one shown in Figure 27.8".

I would like to know whether this input protection circuit comes in-built in GR-PEACH board or it has to be connected externally when integrating a sensor to the GR-PEACH board?