Metabind use: suggester (optionquery)

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1

I would like to try using the optionsquery function of the MetaBind plugin, suggester . Unfortunately, I don’t understand what inputs to pass to generate a search query on Dataview data.
For example, I would like to create a suggestion menu extracted from notes contained in a specific folder, where the customer field exists, and I would like each customer to appear only once, even if there are multiple notes with the same customer .
This will be a teoric comans but not work:

INPUT[suggester(optionQuery(dv.pages('"/foldercustomer/"').groupBy(p => p.customer).map(g => g.key)), showcase):fileSuggest]

Can anyone tell me where to look?"

Best regards

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