How to type in multiple spaces in mermaid?

I'm using VS-Code to edit my markdown file, and need to make flowcharts (graph) to display workflow.

The problem is VS-Code will not properly display the long text title, the last few part will be truncated as showed in follow:

```mermaid
graph LR

azzzzzzzz-->b
```

So I'm thinking of simply adding space after the text. However, I searched through the internet, and cannot find a way to type in multiple space.

```mermaid
graph LR

a[zzz   z   zzzz   ]-->b
```

No matter what I try, the actual title will only display 1 space only. So if anyone can help either on truncate issue of VS-Code or teach me how to type in multiple space.

I've been struggling with it for whole day, please help! Thanks a lot!!