How to sum GetField output in modx evo?

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Darklt2022-03-15 13:18:13

MODX

Darklt, 2022-03-15 13:18:13

There is a GetField plugin that displays the values of the TV parameter, how to summarize them, for example:
[!GetField? &docid=`2` &field=`pagetitle`!] + [!GetField? &docid=`3` &field=`pagetitle`!] = amount ?

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