I often make chips in a convection oven, without any oil or too much salt. Potatoes from the high-temperature line are actually ideal for this. They are in the red packaging.

Migros no longer sells pre-packed potatoes in red packaging, why and why is actually unclear to me.

Customers have to find out for themselves which potato varieties are suitable for French fries. There is, for example, the Victoria variety, which is currently available in blue packaging at Brugger MMM. This is marketed as floury, but is ideal for chips and fries.

At www.kart offel.ch you will find a list of the three cooking types, solid -> marked green, high temperature line -> marked red and floury -> marked blue. The usual varieties are also assigned to the three cooking types.
Instead, brown-packed potatoes are sold, but this is not a cooking type.

Another annoyance:
MMM Brugg AG always sells open potatoes. If you are lucky, there is still a cooking type on it (usually waxy), but unfortunately the variety name is ALWAYS missing. Even after repeated complaints, the variety name is stubbornly omitted. For some time now, the label has stated that these potatoes are imported from Israel. So there is no need for a name, because such ecological nonsense should never be bought.