extension for lsp definition

[Decodetalkers]

Is your feature request related to a problem? Please describe.
I am working on an decompile plugin for csharp_ls, and decompile should come to the plugin to handle it first, then it can be work

Describe the solution you'd like

this is what I am doing

I want an config in option like

something like this

Describe alternatives you've considered

Additional context
Add any other context or screenshots about the feature request here.