See JSON in TiddlyWiki for an overview of using JSON in TiddlyWiki.

Note that

Using ActionSetFieldWidget and ActionListopsWidget

The widgets ActionSetFieldWidget and ActionListopsWidget can manipulate named properties of data tiddlers by indicating the name of the property in the $index attribute.

• To create or modify a named property with ActionSetFieldWidget, provide a $value attribute
• To delete a named property with ActionSetFieldWidget, omit the $value attribute.

ActionListopsWidget assigns the named property the list constructed through its $filter and $subfilter attributes.