access corresponding block from custom action

hi dear developers.

i want to create a custom action. in your first example i see somethings like this:

```
image: {
class: ImageTool,

config: {
actions: [
{
name: 'new_button',
icon: '',
title: 'title',
action: (name) => {
alert(`${name} `);
//access `corresponding` block ???
return false;
}
}
],
}

```

in this action you just used name and alert the name , i want to access block elements from this section and modify an image inside this block (and set width for image). how can i access block from this section?
thanks