We do have grammars for many editors. I'm not sure about LSP off the top of my head but you should find something in the docs under "Integrations".

There is also a VSCode extension: https://marketplace.visualstudio.com/items?itemName=prql-lan...

[PRQL dev here]

We don't have LSP support yet, but it's on the Roadmap. We've designed the language to be very LSP-friendly — one of the benefits of starting with `from` and pipelining each function.