Can I use the library to implement a fallback mechanism？

I want to use this library to use json primitives to achieve an approval/return effect, but I can only do business functions, can not make the current process node back to the previous node, or even earlier nodes. What should I do

Start by reviewing the workflow engine's documented API and entry points for JSON primitives and process-node navigation. Determine whether returning to the previous or an earlier node is supported; done would require a clearly defined, documented fallback mechanism or a precise explanation of the supported approach.

Written by the indexing model from the issue text.