ValueCount ( FilterValues ( valuelist ; "boat" ) ) ; "you selected boat as an option";
"you didn't select boat"
If I undertand you correctly, lets say your user has selected car, boat, and plane from a longer list of values ( car, boat, plane, truck, train, etc )
Then you could use the following:
Let ( [ selected = YourSelectionField;
check = "boat"
]; "You " & Case ( IsEmpty ( FilterValues ( check; selected ) ); "have not " ) &"selected " & check
Where YourSelectionField currently is the field that the user has made selection in of: car, boat, & plane and where check is the value you are looking for.
* Edit - Didnt see Daniele's response
Thank you both so much! This worked great!