feature request: lsp fallback never while using injected formatter

[KevinNitroG]

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Describe the feature

Could we have an option to disable lsp fallback while using the injected formatter

Provide background

I'm using injected formatter in writing markdown with some code blocks that contain programming language. I think I'm different from other people in the issue related (#409, #200), which spawns LSP running in the background, is annoying and resource-consuming (for me).

What is the significance of this feature?

nice to have

Additional details

I have tried so far, but still couldn't achieve what I want

opts = {
  default_format_opts = {
    lsp_format = "fallback",
  },
  formatters = { -- and other formatters setup that I don't list here
    injected = {
      options = {
        lang_to_formatters = {
          json = is_executable("jq") and { "jq" } or nil,
        },
      },
      lsp_format = "never",
    },
  },
},

[chrisgrieser]

I am having the opposite problem – I cannot get LSP formatting to work with injected, injected appears to require to explicitly seting non-LSP formatters in lang_to_formatters to work.