Can we get relational field from relational field?

Hello,
I have relational field in strapi content-type as below
example
How can I access “attrC” if I get data from “A”?

I asked this because i want something like this in my json

::get/A/1

> {
>            fieldA1 : xxxx,
>            fieldA2 : xxxx,
>            relationalToB : [{
>               fieldB1 : xxxx,
>                fieldB2 : xxxx,
>                I want to get relation to C here
>            }, ....]
> }

Thanks