Relationship API request

Hi,
I have the following setup of custom post types:
product <–> categories of content <–> content
To connect them I used the ACF relationships. Requesting the products via API works fine. I get the products and their categories but I don’t get the content (the acf information for the categories is missing).
When I request the categories I get the categories and the content. This makes me think that the request is limited to one ACF relationship.

Is that true? Is it possible to request the product and get it’s relationship to the categories and their relationship to the content?
In short: I need the ACF of the ACF via API