Create property with Station and Offset of Alignment for Blocks

Hi everyone!
Please help!
Сan I automatically set the station and offset from the selected alignment for the selected drawing blocks and write them to the property using dynamo?

I create the Node. Maybe someone tell me where is my mistake?

Could you show all the previews?

Station_Offset.dyn (31.1 KB)

Need dwg file.

StOf.dwg (3.9 MB)

Just add String.FromObject node:

That helped! Thank you so much!