pca9555 io port expander how to change just one output without resending other

Greetings all,

does anyone know how to just set one output on a pca9555 i2c port expander.
i only found examples that set all outputs every time a change is made to one output.

so you have to resend all te states of all outputs every time a change is made and so have to remember the state of all outputs.

greetings, adriaan