Change file content using batch

Question

So I have this going and I need a little help to improve it

@ECHO Off
setlocal ENABLEDELAYEDEXPANSION
cd /d "%~dp0"
:: Significant part of string

set "replacemain="appi": "

@For %%G In ("%~dp0Originals") Do Set "sourcedir=%%~fG"
@For %%G In ("%~dp0Ready") Do Set "destdir=%%~fG"

FOR /f "delims=" %%q IN ('dir /b /s /a-d "%sourcedir%\(*)*.txt"') DO (
 rem calculate new destination directory
 SET "newdest=%%~dpq"
 SET "newdest=!newdest:%sourcedir%=%destdir%!"
 SET "newdest=!newdest:~0,-1!"
 MD "!newdest!" 2>nul

(
 FOR /f "tokens=1 delims=()" %%j IN ("%%~nxq") DO (
  rem %%j now has sequence number
  for /F "tokens=1* delims=:" %%a in ('findstr /N "^" "%%q"') do (
   set "line=%%b"
   if defined line IF "%%b" neq "!line:appi=!" CALL :subs %%j
   echo(!line!
  )
 )
)>"!newdest!\%%~nxq" 

)
GOTO :eof

:: substitute
:subs
SET "original=%line%"
FOR /L %%s IN (0,1,9) DO set "line=!line:%replacemain%%%s=%replacemain%!"
IF "%original%" neq "%line%" goto subs
set "line=!line:%replacemain%=%replacemain%%1!"
GOTO :eof

This is designed to read anything in the filename in closed by ( )

Main Folder
|
+-\Orignal
|--| + - (100) Craft.txt
|--------------"appi": 4748483,
+-\Ready
|--| + - (100) Craft.txt
|--------------"appi": 100,

My script is based on 1 code editing and now I have been trying to change it to multiple code editing

As you can see here, this is set for one code I would like to change it to a type of dictionary

set "replacemain="appi": "

My goal

replace=replacemain = ("appi":
                       "code":
                       "gedt":)

set "replace"

if defined line IF "%%b" neq "!line:replace=!" CALL :subs %%j
       echo(!line!

Could this be possible, and all codes will change to match the file name in the (?)

Also is there a way to increase the speed of the script

Thank you

This is how it looks inside my txt file

BEFORE
(100) filename.txt
    |----"appi": 4748483,
         "code": 415241,
         "gedt": 458421,

AFTER
(100) filename.txt
    |----"appi": 100,
         "code": 100,
         "gedt": 100,