How to use LSP with ROOT Header?

Hi everyone.
I’m currently trying to use LSP (clangd) working, so i can have auto-completion and suggestions, while coding. Nevertheless, I just can´t make it work with ROOT header files. It is my first time configuring LSP(Clangd) and I’m absolutely lost. How is this supposed to be done?

ROOT Version:6.28.04
Platform:, Debian 12
Code editor: Kate.
Compiler:_ Not Provided