Do you know about RiderFlow? It's a free editor asset from JetBrains to improve the Unity Editor:
https://www.jetbrains.com/riderflow/
https://assetstore.unity.com/packages/tools/level-design/riderflow-218574
It even has a basic C# editor built-in.
JetBrains
A free plugin for the Unity Editor that helps you gain a deeper understanding of scenes. It provides you with the tools you need to instantly navigate and search through the scenes, understand the connections between scene elements, and manage a scene effectively.