myData = [
{drug: "Cocaine", overdoses: 1000},
{drug: "Cannabis", overdoses: 1},
{drug: "Fentanyl", overdoses: 50000},
{drug: "MDMA", overdoses: 300},
{drug: "Methamphetamine", overdoses: 20000}
]
.map(({drug, overdoses}) => ({letter: drug, frequency: overdoses}))