the way I do it in rails is as follows:

/views/contacts/index.html.erb

- main template for the contacts controller root URL and if that has something like the active search pattern in it:

html
<h3> 
  Search Contacts 
  <span class="htmx-indicator"> 
    <img src="/img/bars.svg"/> Searching... 
   </span> 
</h3>
<input class="form-control" type="text" 
       name="search" placeholder="Begin Typing To Search Users..." 
       hx-post="/search" 
       hx-trigger="keyup changed delay:500ms" 
       hx-target="#search-results" 
       hx-indicator=".htmx-indicator">

<table class="table">
    <thead>
    <tr>
      <th>First Name</th>
      <th>Last Name</th>
      <th>Email</th>
    </tr>
    </thead>
    <tbody id="search-results">
    </tbody>
</table>

I'll use the ID of the element I am targeting for a template name:

/views/contacts/_search_result.html.erb