Yes, the BitBox02 allows you to create your own wallet seed without the help of additional hardware or software. Because humans are surprisingly bad at making random choices, the best way is to roll dice. It sounds ridiculous, but this is a proven way to get enough randomness (also called "entropy").
But please be aware, you don’t need to do this. The BitBox02 uses five
different sources of entropy to create high-quality randomness: from
manufacturing, your device password, the host computer, the
microcontroller and the secure chip. Each source can only add
randomness, not reduce it. With the firmware fully open-source and
reproducibly built, anyone can check how that works.
hardware wallet should be a tool for personal sovereignty. This is why
creating your own seed can be an empowering experience. And if done
well, you can get a truly random seed that can easily be verified, with
zero trust put in the inner workings of the BitBox02 to create
Read more in our step-by-step guide that comes with everything you need, including instructions to download to do everything offline: