coracle has a WoT function in it, they are showed beside user names at the top of notes, you would need to start with using code like that to build the graph so you can then define your collection function that selects items from it

i see no reason why you can't start with testing it that way, there is also several web tools that let you construct transactions as well, you can test that they work before you build an interface for it

besides all that, if you have code that does the thing, and if it was in javascript, it could be added to an existing app quite easily i would think