const data = {
  PortLand: '78/50',
  Dublin: '88/52',
  Lima: '58/40',
}

Object.defineProperty(data, 'Lima', {
  enumerable: false,
  writable: false,
})

console.log(Object.keys(data))
// ["PortLand", "Dublin"]

console.log(Object.getOwnPropertyDescriptors(data))
// PortLand {value: "78/50",writable: true,enumerable: true,configurable: true}
// Dublin {value: "88/52",writable: true,enumerable: true,configurable: true}
// Lima {value: "88/52",writable: true,enumerable: false,configurable: true}

console.log(Object.getOwnPropertyDescriptor(data, 'Lima'))
// {value: "58/40",writable: false,enumerable: false,configurable: true}

data.Lima = '59/50'