Is it possible to assign a function to keymaps in Lspsaga finder config ?

[eshepelyuk]

Hello

I would like to use this plugin https://github.com/nvim-focus/focus.nvim to open LSP references files
insted of using native split.
Is it possible to assign a function to finder.keys so I could call other plugin funcions.

Smth like

require('lspsaga').setup({
  finder = {
    keys = {
      on_open = function(params_with_file_path) 
      .....
      end
    }
  }
})