Highlighting extmarks generated by lsp (rust-analyzer)

Neovim
1

I have been able to set the DiagnosticInfo and others to a custom color. However, I have not been able to do so for the “virtual text”, aka “extmarks” that provide type information (in my case) using rust-analyzer.

So the following is working:

hi Comment            ctermfg=72   guifg=#83A8C1
hi DiagnosticInfo     ctermfg=72   guifg=#808080
hi DiagnosticHint     ctermfg=72   guifg=#288080

I had tools that provided me with the highlight group under the cursor but have since broken with the updates to a more lua dominated set of plugins.

Has anyone been able to configure the rust-analyzer type information printed using extmarks?

Note: the treesitter command Inspect is generally helpful but not with virtual text.