Retrieve all instances of a custom Blazor component on a Blazor page

I would like to get all the instances of a Blazor components on a Blazor Page:

Page:

<div class="mb-4 pt-3"><SearchFilter Refinement="@refinementAuthor" FilterTitle="Auteur"></SearchFilter></div><div class="mb-4 pt-3"><SearchFilter Refinement="@refinementSubject" FilterTitle="Onderwerp"></SearchFilter></div><div class="mb-4 pt-3"><SearchFilter Refinement="@refinementLanguage" FilterTitle="Taal"></SearchFilter></div>

How can I get a List of the three "SearchFilter"?