Dan has pointed you to the FAQs which has the answer, and is a good place to start. Specifically:
Most newer devices will include the h.265 option out of the box - on my Samsung phone it’s called “high efficiency videos” - so if this is really your desired format you can try enabling a similar setting, then experiment to make sure it is working as expected. It will save re-encoding, but there are some downsides (like occasional compatibility issues and poor playback on older computers).