[Feature request] Add option to fetch data from other sources

[ghostbuster91]

Hi,

Thanks for the great plugin.
I wonder if it would be possible to allow getting data from other sources than LSP.

For example I would like to populate it with data from the treesitter if LSP is not available.
This would allow me achieving something similar to https://github.com/phelipetls/jsonpath.nvim

[pidgeon777]

Yes, it would be great for navic to also access treesitter information.

Also, navbuddy could improve itself by using treesitter as a source.