well, after many failed attempts i made a search for $set in TW5 sources
and finally i got a solution like this
\define makePdfBookLink() $(pdfBookUrl)$#page=$(pdfBookPageNo)$
\define page(p:"1")
<$set name="pdfBookUrl" value={{WhereIsMyBook!!url}}>
<$set name="pdfBookPageNo" value="$p$">
<a class="tc-tiddlylink-external" href=<<makePdfBookLink>>
target="_blank">$p$</a>
</$set></$set>
\end
which seems to work
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