input.geojson

{
  "type": "FeatureCollection",
  "generator": "overpass-ide",
  "copyright": "The data included in this document is from www.openstreetmap.org. The data is made available under ODbL.",
  "timestamp": "2018-01-31T00:04:02Z",
  "features": [
    {
      "type": "Feature",
      "properties": {
        "@id": "way/147600033",
        "leisure": "park",
        "name": "Praça 15 de Novembro"
      },
      "geometry": {
        "type": "Polygon",
        "coordinates": [
          [
            [
              -47.058473,
              -22.8945701
            ],
            [
              -47.0585905,
              -22.8955003
            ],
            [
              -47.0583316,
              -22.8957354
            ],
            [
              -47.0580654,
              -22.8957794
            ],
            [
              -47.0578891,
              -22.8946715
            ],
            [
              -47.058473,
              -22.8945701
            ]
          ]
        ]
      },
      "id": "way/147600033"
    },
    {
      "type": "Feature",
      "properties": {
        "@id": "way/148000073",
        "leisure": "park",
        "name": "Largo Santa Cruz"
      },
      "geometry": {
        "type": "Polygon",
        "coordinates": [
          [
            [
              -47.0587962,
              -22.8945166
            ],
            [
              -47.0589213,
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            ],
            [
              -47.058611,
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            ],
            [
              -47.0585458,
              -22.894555
            ],
            [
              -47.0587962,
              -22.8945166
            ]
          ]
        ]
      },
      "id": "way/148000073"
    }
  ]
}

markers.csv

output.geojson