yes you summarized it correctly.
Inside the process designer you’d have to use this business object and save the result (true / false) as a variable.
For the UI you want to change, you can then check if this value is true or false and print display the desired text. You can do this using condition and UI action shapes or use expression binding which could look something like this:
{= ${variableHolder>/UserHasRoleXY} ? ‘user has role’ : ‘user does not have role’}
