no, but you can read it from C++ with
#include <Gpio.h>
Gpio belaCapeButton;
....
bool setup(...)
{
belaCapeButton.open(BELA_CAPE_BUTTON_PIN, INPUT, false);
}
void render(...)
{
...
bool buttonValue = belaCapeButton.read();
...
}
then you can use a custom render.cpp
for your Pd project, use the above to read the input and send it to pd with libpd_float("receiverName", buttonValue);
. See here for a brief introduction to how to do the above, and feel free to come back if you have more questions.