Question about Advanced settings of the Embedded content processor

Hello,

Having a look to the SDL doc I found that.

It seems that in the Advanced settings of the Embedded content processor, we can specify how tags are displayed.

For example, there is an option for text equivalencies: 

Tags represents the text

Placeholder (standalone) tags only.

A tag can have a text equivalent. For example, the entity tag " has the text equivalent ".

I tried to add the á as a placeholder and told in Advanced settings that this Text is equivalent to the character á, but nothing happened. SDL filters á correctly, but it does nothing with the character á.  

I am not sure to understand well the purpose of this option and how it works.

Could somebody please help me to understand it with an example.

Thank you in advance,

Best regards,

Javier