Checking selected date matches with any of the date from one SharePoint list

Hello everyone,

In my PowerApp, I have one dropdown field for date selection, and

I have one SharePoint list which have 'date type' (exclude time) column in it.

So after selecting a date I want to check if selected date matches with any of the date from SharePoint list , and if it matches disable one text input.

How can I achieve this ? Please help.