The concept is "Bionic reading is a text-processing method and typeface concept that bolds the initial letters of words to guide the eyes. Created by Swiss designer Renato Casutt, it aims to increase reading speed and focus by letting the brain complete the rest of each word."
This was noticed to help people with adhd or austism read a much better reading flow im not sure if this concept will work with bangla but it is a accessibility thing an example of this font would be this

Example

• Fast_Mono: The quick brown fox jumps over the lazy dog.

Need to look into

• The coding behind this font because it is adaptive
• if this will work for bengali charecters

Resources

Bionic Reading