Task: Convert an array into an array of objects

n8n workflow:
{"nodes":[{"name":"Mock Data","type":"n8n-nodes-base.function","position":[550,300],"parameters":{"functionCode":"return [{json:[\"item-1\", \"item-2\", \"item-3\", \"item-4\"]}];"},"typeVersion":1},{"name":"Function","type":"n8n-nodes-base.function","position":[750,300],"parameters":{"functionCode":"return items[0].json.map(item => {\n  return {\n    json: {\n      data:item\n    },\n  }\n});\n"},"typeVersion":1}],"connections":{"Mock Data":{"main":[[{"node":"Function","type":"main","index":0}]]}}}