How to filter by value not directly in nodes

Hi,

Here's an example of my query :

```
query Home {
posts: allWordPressPost {
edges {
node {
title
content
path
featuredMedia {
sourceUrl
}
categories {
slug
title
}
date
acf {
howToDisplay {
value
label
}
firstParagraph
}
}
}
}
}
```
Do you know how to filter by categories.title ?

Thanks in advance :)