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Iโve found a solution:
In my object, I add a value who concatenate the original Name and the name without special chars using latinize.js module:
import latinize from 'latinize';
Person.searchLastName = Person.LastName + ' ' + latinize(Person.LastName);
In the headers object, I use my new value, but I add a template to replace this content by original value like that:
<template #[`item.Person.searchLastName`]="{ item }">
<!-- use different value to allow search without special chars -->
{{item.Person.LastName}}
</template>
Source:stackexchange.com