72dpi at 100% will appear aliased.
Better to export it at 150dpi even with a slightly lower quality setting, this will give a better result.

Masoodm would be nice if you would share the GREP used to create the effect.

It has to be a Find and Replace with or with GREP.
Do no think it can be done with a GREP in a Paragraph style because that can only add formatting not do a replace

This is not very hard.
Set up a Paragraph style with the font set to 16pt
Then go to Bullets and Numbering in this dialogue box, set Numbering, then click the CHaracter Style drop box and setup a Character Style of 72pt (call it say Number Bullet).
Then Indents and Spacing and set a Space Before of about 25pt (change this to get the space between point as you want them)

Just an optical effect with the computer display. You can get it more with complimentary colours.
For this to really show on screen try Red text on Cyan.
Remember that when a document is commercially printed it will be trapped to ensure that this type of issue does not occur.

These might lead you in the right direction

TOC advanced setup – NEWBIE NEEDS HELP!!

Hidden text frames for TOC

Chris
The World Ready Composer help to space the accents vertically correctly (not sure what they are called in Thai).
But the text displays either way.
I used this sample text https://www.omniglot.com/babel/thai.htm
Placed that, it all comes out as the hashed rectangles of unicode characters that are missing.
Run GREP find and replace with either a Character or Paragraph style (I prefer the Paragraph style as long as the Thai text is alone in a paragraph the find will work and nor miss anything, if there is mixed text then you will need to use a character style) and the text appear correctly in Thai.
Really need someone who reads Thai to ensure it is correct.