from the game folder where you have the .jar/.exe --- newlife_gamedata\saves <<<<
the new saves are now .json files, that can be opened up with any text editor.
If you use Notepad++, it should come with the json viewer plugin, so go into the plugins menu at the top, to JSON Viewer, then hit Format Json. It will take the long string of text and then break it out into more easily readable sections.
Plus again with it in Notepad++, after you do that, you can use the +/- on the side to expand and contract the various sections to help navigate too.
You can then save it that way and the game will still interpret it correctly, as long as your edits are clean and within the variables scope/range.
Already caught myself a few times forgetting commas or quotes in various sections causing issues, but the error that comes up in the game usually has the row/column (after using the above Format JSON option) where theres an issue.
Another thing I noticed is some variables where you might expect to have a "0" (zero) to represent "no data", it actually instead uses "null" typed out.