Accessing a FieldItemList value within Twig
To get the value you've highlighted in the debug output in Twig:

{{ content.field_latitude['#items'].0.value }}


You can see this follows the path you've shown in the screenshot, but missing the protected values array. Instead it uses .value on the field item, which calls a magic method __get('value') to retrieve the protected property.

But as @MarioSteinitz commented it's better to use the node object:

{{ node.field_latitude.value }}


Because content is not an API like the methods of the node object. It is a render array which can change when you configure the field display differently or install a layout module.

And never use the |raw filter on user input!