Currently, the "Next Field" functionality simply presses the tab key on your keyboard, which, for most software on your computer, causes the active cursor to move from one field to the next.
If you can press the tab key on your computer keyboard to navigate between fields (or shift + tab to move backwards), then the spoken command "Next Field" will let you accomplish this hands-free.
As for templates, the ability to specify "blanks" that can be navigated using your voice, and then filled out with a dictation, will be available when we release our Templates functionality, likely in Q1 of 2022.