I found answer for that. Follow this below steps to solve this issue :
Add Field in system.xml file :
<field id="wysiwyg_editor" translate="wysiwyg" sortOrder="4" type="editor" showInStore="1" showInDefault="1" >
The solution for the issue of the double quotes being changed into " is as following (scroll down to go directly to the solution).
From Magento docs: https://docs.magento.com/m2/ee/user_guide/marketing/markup-tags-links.html
When used with an anchor tag, the markup tag is placed inside the
double quotes of the anchor. To avoid confusion, you can ...
After many searches I have concluded with my test with "Enable WYSIWYG Editor" set it to Disable Completely.
Due to this, We will have simple Editor with default buttons for insering variables and widgets that is more usefull than buggy editor.
After disabling it we will have this like
We can disble it from