Please find the sample code below.

    type Profile = {
    name: string;
    age: string;
    designation: 'developer' | 'QA' | 'manager';
    grade: 'A' | 'B' | 'C';
}

const profiles: Profile[] = [{
    name: "kamal",
    age: "20",
    designation: "developer",
    grade: "A",
},
{
    name: "arun",
    age: "25",
    designation: "developer",
    grade: "A",
},
{
    name: "chan",
    age: "23",
    designation: "developer",
    grade: "A",
},
];

function profileLookup(name:string, prop:keyof Profile) {
    for (let i = 0; i < profiles.length; i++) {
        if (profiles[i].name === name) {
            if (prop in profiles[i]) {
                console.log(profiles[i][prop]);
            }
        }
    }
}

profileLookup("arun", "age");