How to send parameters to UiPath Custom activities build in VS2022

I have created a custom activity (using Visual Studios extension UiPath Activity Creator). That takes input from user and do stuff accordingly.
I need to pass certain hard coded input params as well (I don’t want them to be shown as Input Params in UiPath Studio).
How can I send the params to my custom activity? Currently I can only use Input properties to pass data to my activity