How to add class to content element div using typoscript ?

Generally, the content element div looks like this

<div id="c286" class="csc-default"></div>

Below typoscript helps to add custom class to content element div's to look like below

<div id="c286" class="block csc-default"></div>

The typoscript is

tt_content.stdWrap.innerWrap.cObject.default.20.5 = TEXT
tt_content.stdWrap.innerWrap.cObject.default.20.5 {
   value = block
   noTrimWrap = || |

This way we can preserve the default class like "csc-default" with our new class.

Below is the actual output