Correct - you cannot use pipes inside object constraints. If you need the multikv command, then you need to use a search-based object. If you're not planning to accelerate your data model, you're probably fine just using the search-based object.
If not, you can use multikv.conf to set up your extractions to happen automatically. If you do this, the fields will appear in search in the format you need, and you'll be able to build a data model on top of them using event-based objects.
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