Making clangd LSP recognizing GNU-specific headers

I have coc.nvim installed for autocompletion in vim. I usually include bits/stdc++.h(GNU-specific) in my files for competitive programming.

I use the g++ compiler so I have no trouble there, but since I’m using clangd language server for coc, syntax checking doesn’t recognize the header and displays errors in the include path. Is there any way to add bits/stdc++ to clangd include path?