сonst destinationToTitleMapper = {
    somedest: local.foo,
    otherdest: local.bar,
    // ....
};

const title = destinationToTitleMapper[destination];

------- Либо свичом:

let title;

switch (destination) {
case 'somedest':
    title = local.foo;
    break;
case 'otherdest':
    // ....
}