In D8 I would like to display an array in the message part of a page. I did several things but could not get it work. What to do?

I installed the devel and kint modules. 

I currently have changed in services.yml the settings into:

```
debug: true   
auto_reload: true   
cache: false

```

In the twig template I added 

```
{{kint("I'm working from the page.html.twig")}}

```

This is displayed in the browser, so the current theme is displaying it which proves kint is working and the correct theme is used.

So now In my module file I have

```
$data_array = json_decode($data,true);
kint($data_array);
var_dump($data_array);
return $data_array;

```

The var\_dump gives a lot of data in a array. However the kint is not displayed.

How to get the kint displayed this array?