Well, obviously you work with Civil 3D 2025.0 without any updates. If not, you would not get C3DToolkit loaded. That means you can also load the Arkance Systems Node Library and that package contains Text nodes you need:
But, in case you update Civil 3D 2025 to 2025.1 or 2025.2, both the Arkance Systems Node Library and the C3DToolkit will not load anymore, and both are not further maintained.
If so, you need the new The Civil Nodes library, which is a continuation of the Arkance Systems Node Library. But that one will not load in Civil 3D 2025.0, only in 2025.1 and higher.