This is my design proposal, it seems that it has not been implemented as expected

[MaJinjie]

Is your feature request related to a problem? Please describe.
I want to add while filtering forward! Perform reverse filtering on symbols.
The example of prefixes is as follows. Is there a way to solve it?

Describe the solution you'd like

prefixes = {                                                                        
  ["#"] = {                                                                         
    -- in the above example #lua,md -> input: lua,md -> output: --iglob="*.{lua,md}" 
    flag = "iglob",                                                                 
    cb = function(input) return string.format([[*.{%s}]], input) end,               
  },                                                                                
  ["#!"] = {                                                                        
    -- in the above example #lua,md -> input: lua,md -> output: --iglob="i*.{lua,md}" 
    flag = "iglob",                                                                 
    cb = function(input) return string.format([[!*.{%s}]], input) end,              
  },                                                                                
  -- filter for (partial) folder names                                              
  [">"] = {                                                                         
    flag = "iglob",                                                                 
    cb = function(input) return string.format([[{%s}*/**]], input) end,             
  },                                                                                
  [">!"] = {                                                                        
    flag = "iglob",                                                                 
    cb = function(input) return string.format([[!{%s}*/**]], input) end,            
  },                                                                                
  ["<"] = {                                                                         
    flag = "iglob",                                                                 
    cb = function(input) return string.format([[**/{%s}*/*]], input) end,           
  },                                                                                
  ["<!"] = {                                                                        
    flag = "iglob",                                                                 
    cb = function(input) return string.format([[!**/{%s}*/*]], input) end,          
  },                                                                                
  ["&"] = {                                                                         
    flag = "iglob",                                                                 
    cb = function(input) return string.format([[**/{%s}*/**]], input) end,          
  },                                                                                
  ["&!"] = {                                                                        
    flag = "iglob",                                                                 
    cb = function(input) return string.format([[!**/{%s}*/**]], input) end,         
  },                                                                                
  ["@"] = {                                                                         
    flag = "iglob",                                                                 
    cb = function(input) return string.format([[{%s}]], input) end,                 
  },                                                                                
  ["@!"] = {                                                                        
    flag = "iglob",                                                                 
    cb = function(input) return string.format([[!{%s}]], input) end,                
  },                                                                                
},                                                                                  

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Additional context
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