You can use SketchUp 3D modelling software to create your own 3D texts that can be added to your Ecdesign floor plan.
Here are the steps.
1. Install Sketchup.
2. View video tutorial to learn how to create a 3D text
3. Save the text object. File>Save as (in SketchUp).
4. Start Ecdesign and select IMPORT new object. Import the 3D text object.