special price without rounding with 4 decimals

I need to show the special_price field on the backend with 4 decimal and without rounding. When I put 4 decimal value in speical_price text field it saves in DB same as I put on the text field but after saving the product it changes into 2 decimal and round it.

Before Save

In db

After saving product successfully

Expected Result after saving product it should be 6.1975 in backend text field

Can anyone guide me on which classes are responsible for rounding and renderer price?