The search does not search the visible results of all macro outputs on the page, but instead it searches only the same text that would be available in the editor.
If you want it to be able to be searchable, then I would recommend making a part of your user macro create an invisible div (can be done with class="hidden") and save it to the end of the page. Something like this:
Your user macro can search if the hidden div exists, and only if it doesn't exist, then it will create one (that way it doesn't create a new div and page save every single time). Because it is then saved in the storage format, it should show up in the search.
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