Seeeduino XIAO: Should I connect a capacitor to the 5V pin?

I have a Seeeduino XIAO powered by a 3.7V Li-on battery, which is in turn charged by a 6V solar panel connected to a TP4056 charging module. The Seeeduino has a step-up converter that provides stable 5V to the 5V pin.

Should I connect a capacitor between the 5V and GND pins on the Seeeduino? Or are the capacitors built into the step-up enough? If I were to connect a capacitor, which value of capacitance would be recommended?

Charging converter used:
Step-up converter: Mini Step-Up 2.5~5V to 5/8/9/12V 1A max