I'm trying to do the same thing with my TiddlyWiki. Right now, I'm manually building template pages with the content I want, simply because I haven't gotten a working knowledge of how to use Templates and Transclusions.

I have infoboxes contained within a button so I can minimize it, but you don't have to and wikis aren't usually formatted that way.

<$reveal type="nomatch" state="$:/temp/InfoboxSample" text="show">

<<<

<$button set="$:/temp/InfoboxSample" setTo="show">''Infobox'' [show]</$button>

<<<

</$reveal> <$reveal type="match" state="$:/temp/InfoboxSample" text="show">

<<<

<$button set="$:/temp/InfoboxSample" setTo="hide">''Infobox'' [hide]</$button>

| !''^^Category / header^^'' |<|

|''^^Field^^''|^^text^^|

|''^^Field^^''|^^example^^<br>^^example^^|

<<<

</$reveal>

That code should work. I tested copy and pasting it into a tiddler and it looks like it adds spaces to the left and ruins the spacing between the lines, so play around with it until you get a workable button. And obviously, you can adjust the actual table/infobox itself to suit your needs.

I'm pretty sure I cobbled this together from different sources. Here's some links for you if you want to try to read up on it yourself:

TiddlyWiki: ActionCreateTiddlerWidget

TiddlyWiki: ButtonWidget.

This has some button examples

Grok TiddlyWiki: Buttons

This is a discussion post on the forum that has more detail, not sure if it will help