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Finally I found it myself. We need just to use coords property of LineStringField, like this:
>>> event.route.coords
((15.732421875, 8.5775756835938), (10.986328125, 3.3041381835938), (3.779296875, 10.862731933594), (-1.58203125, 7.8744506835938), (-4.74609375, 14.114685058594))
>>> event.route.x
[15.732421875, 10.986328125, 3.779296875, -1.58203125, -4.74609375]
>>> event.route.y
[8.5775756835938, 3.3041381835938, 10.862731933594, 7.8744506835938, 14.114685058594]
>>> event.route.json
'{ "type": "LineString", "coordinates": [ [ 15.732421875, 8.5775756835938 ], [ 10.986328125, 3.3041381835938 ], [ 3.779296875, 10.862731933594 ], [ -1.58203125, 7.8744506835938 ], [ -4.74609375, 14.114685058594 ] ] }'
Source:stackexchange.com