Override the output of views with angular directives
After a lot of research and debugging i came across to this solution...

The problem of restriction of custom text field of a view is that it uses Xss::filterAdmin function (core/modules/views/src/Plugin/views/PluginBase.php:398 line)...

So i created module, then in mymodule.views.inc file I alter "hook_views_plugins_field_alter", i changed class that uses the views custom text filed in my own class that i created in mymodule>src>plugin>views>field>my_Custom.php.
 This class is copy/paste of core/modules/views/src/Plugin/views/field/Custom.php and changed only the \Drupal\views\Plugin\views\PluginBase::viewsTokenReplace only this form:

$build = [
    '#type' =&gt; 'inline_template',
    '#template' =&gt; $text,
    '#context' =&gt; $twig_tokens,
    '#post_render' =&gt; [
      function ($children, $elements) {
        return Xss::filterAdmin($children);
      }
    ],
  ];


to:

 $build = [
    '#type' =&gt; 'inline_template',
    '#template' =&gt; $text,
    '#context' =&gt; $twig_tokens,
    '#post_render' =&gt; [
      function ($children, $elements) {
        return $children;
      }
    ],
  ];


and from now the custom text don't escapes html tags...

For more control i created also one checkbox in field setting to control f i want to escape the text or note for this field and accordingly to the value of checkbox i activate or deactivate the Xss::filterAdmin function