No. ricardo.ch doesn't offer a solution for a customer to choose an option. Plus, there are some many combination possible of custom options and custom attributes that it will make hard to define a proper process to publish those options on ricardo.ch. However, we will try to find a global solutions after to have several feedbacks.
There is however a solution, you can create a simple product having the options implicitly (no custom options settings or similar) that you want to sell and list it to ricardo.ch
Do not hesitate to contact us to share your needs, we may use them for a future version.
You will see when a product has a custom option in the products listing grid thanks to the warning icon: