JSFiddle - React, Tailwind, and code Playground
JavaScript
let props = ["prop1","prop2"], arr = ["Asthma", "Allergy", "Sports and Fitness"];
const mapped = props.map(prop => {
return arr.map(i => `${prop}: ${i}`);
});
const res = Object.keys(mapped).reduce((acc, next) => {
acc += mapped[next].join(' ') + " ";
return acc;
}, "");
console.log(res);