How to make Chapters for MKVToolNix

[Subtitles]

I have a YouTube music concert with about 18 songs. The time stamp for when each song starts is given in the webpage but the video doesn't have chapter markers.
I want to have 18 different files for each song in the end.
Making chapters using MKVToolNix is a time consuming process so I am trying to find an easy way to make a chapter file that MKVToolNix can accept.
Any easy solution would be much appreciated.
Thanks.

[Subtitles]

Sorted

Create a text file like this:

CHAPTER01=00:00:00.000
CHAPTER01NAME=Introduction
CHAPTER02=00:02:30.000
CHAPTER02NAME=First Scene
CHAPTER03=00:05:15.500
CHAPTER03NAME=Climax

Fill in all the timestamps when a new chapter starts and then save it as a text file.
Then open MKVToolNix, upload the mp4 or mkv file, then add the text file.

Important

Then click on Multiplexer > Output
On the right pane, under chapters, click on Chapter file and add the chapters text file.
If you don't do this, the multiplexing will not work.

If you want to split the file by chapters at this stage then:
On the left pane, under Splitting,
Select Split Mode > Before chapters
Chapter numbers: Type "all"
Leave Maximum number of files: Unlimited.

Then click on Start Multiplexing
If everything went well then you should get several video files in the output.
Edit the chapters names if you want to distinguish each song from the rest.

[pcspeak]

Here's a batch file I knocked up to make myself a quick template.
I've not used it for some time.

chaps.cmd

@echo off
if exist chapters.txt del chapters.txt
set count=0
set /p total=How many chapters?
for /L %%a in (1,1,%total%) do call :process %%a
echo chapters.txt | cmd
exit

:process
set /a count=%count%+1
if %count% lss 10 set zero=0
echo CHAPTER%zero%%~1= >> chapters.txt
echo CHAPTER%zero%%~1NAME= >> chapters.txt
set zero=
goto :eof

[Subtitles]

Here's a batch file I knocked up to make myself a quick template.
I've not used it for some time.

chaps.cmd

@echo off
if exist chapters.txt del chapters.txt
set count=0
set /p total=How many chapters?
for /L %%a in (1,1,%total%) do call :process %%a
echo chapters.txt | cmd
exit

:process
set /a count=%count%+1
if %count% lss 10 set zero=0
echo CHAPTER%zero%%~1= >> chapters.txt
echo CHAPTER%zero%%~1NAME= >> chapters.txt
set zero=
goto :eof

Nice. Thanks.

It would help to add the times format 00:00:00.000 to the CHAPTERS as it is a real pain filling out the times.
I took the liberty to modify this line, hope that you wouldn't mind:
echo CHAPTER%zero%%~1=00:00:00.000 >> chapters.txt

Like in the example above and below:

CHAPTER01=00:00:00.000
CHAPTER01NAME=Introduction
CHAPTER02=00:02:30.000
CHAPTER02NAME=First Scene
CHAPTER03=00:05:15.500
CHAPTER03NAME=Climax

[pcspeak]

I took the liberty to modify this line, hope that you wouldn't mind:
echo CHAPTER%zero%%~1=00:00:00.000 >> chapters.txt

All good.