Create a tiddler called "QR" containing:
\define QR(text)
<img src="http://chart.apis.google.com/chart?chs=150x150&cht=qr&chl=$text$";>
\end
<$macrocall $name="QR" text={{!!title}}/>
Anywhere you need a QR code, use it like this:
{{hello world||QR}}
The technique is explained on http://tw5magick.tiddlyspot.com in "A global
Macro - with limitations"
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