In our Map item's ShapeMapSeries we support only POLYGON and MULTYPOLYGON well-known-text types, because these types make most sense when showing closed figures as datapoint markers over the map surface. The Map is a data-bound item, so it uses these entities to display information that represents aggregated values from its data source, that are visually comparable with the other figures in the displayed series. For example, the choropleth map adds another layer of information just by changing the color of a polygon according to its data-bound value.
We do not support drawing primitives like LINESTRING, POINT, etc, because it would be more in a scope of a mapping tool and it would shift our focus from data-oriented presentations. However, we are always trying to improve our product based on user suggestions, so you can log a feature request in our Feedback & Ideas portal.
Depending on users votes, we will schedule it for discussion and implementation in a future release of our product.
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