Hi @simieski ,
Here’s a link to all the [https://www.partmaster.co.uk/bosch/washing-machine/waq283s0gb01/hose/catalogue.pl?shop=bosch&path=112757&model_ref=10408388&refine=hose&page=1|hose, tube and clamp parts] for your washer. (there are 2 pages, click on 2 at the bottom of the first page to view more parts)
You may be able to find the hose/tube that you are asking about and check if yours matches the image or if there is something different between the two
There are also several clamps mentioned albeit some without images.
If you find the correct hose or tube perhaps you could contact the part supplier and ask if it is clamped on.
The image of the bottom of the dispenser tray shows two outlets without a barbed end so presumably if something is attached to them it may have to be clamped on.
Sorry I can’t be of much help on this one.