Hello, I need to add two vertex (points) to one polygon. I need to join them to the nearest vertex of this polygon.

You could try using the AnchoredSnapper in mode Vertex Snapping. The points are the Anchors and the polygon is the Candidate. Note that the snapping distance is specified in ground units relative to your coordinate system.

Thank you very much.

I try the AnchoreSnapper but it doesn't work like I need. The distance I specifie is 13200 but it joins the vertex of 22000. Is it possible to join the nearest vertex, without the distance?

I don't think the anchored snapper will work here because it will move the corner vertices rather than add additional vertex. I'd use the neighbourfinder to find the closest point on the polygon then a vertex creator to create a line from point to polygon, separately i'd create a line between your two points and then a line combiner and line closer followed by a dissolver

Yup, @ebygomm​  is right, the AnchoredSnapper isn't the right tool here. My mistake.