Dropdown menu within a menu in NavBar for Bootstrap - bootstrap-5

Question

I am trying to create a dropdown of sub-links in a Navbar dropdown menu. Here is my current progress. I am not able to introduce the toggle button and proper toggle mechanism. When I press on the テンプレート管理, the entire dropdown menu disappeared, and I have to click the navbar menu again to see the list. The expected result is in the screenshot, not sure if Bootstrap has such similar component to use.
<div class="collapse navbar-collapse" id="navbarText">
<ul class="navbar-nav me-auto mb-2 mb-lg-0">
</ul>
<div class="dropdown">
<a class="nav-link" href="#" id="navbarDropdownMenuLink" role="button" data-bs-toggle="dropdown" aria-expanded="false" style="padding: 0.5rem 0">
<%= inline_svg_tag 'setting.svg' %>
</a>
<ul class="dropdown-menu dropdown-menu-end dropdown-menu-lg-end" aria-labelledby="dropdownMenu2" >
<li class="mt-2" >
<%= link_to hospital_manage_hospitals_path, class: "dropdown-item" do %>
<%= inline_svg_tag 'hospital.svg' %> 医療機関管理
<% end %>
</li>
<li class="mt-2">
<%= link_to hospital_manage_hospital_admin_contacts_path, class: "dropdown-item" do %>
<%= inline_svg_tag 'logout.svg' %> 担当者管理
<% end %>
</li>
<li class="mt-2">
<%= link_to hospital_manage_referral_companies_path, class: "dropdown-item" do %>
<%= inline_svg_tag 'handshake.svg' %> 人材紹介会社管理
<% end %>
</li>
<li class="mt-2" data-bs-toggle="collapse" href="#collapseExample" role="button" aria-expanded="false" aria-controls="collapseExample" >
<%= link_to hospital_manage_referral_companies_path, class: "dropdown-item" do %>
<%= inline_svg_tag 'template.svg' %> テンプレート管理
<% end %>
</li>
<div class="collapse" id="collapseExample">
<ul>
<%= link_to hospital_manage_spot_job_templates_path, class: "dropdown-item mt-2" do %>
スポット求人
<% end %>
<%= link_to hospital_manage_spot_job_templates_path, class: "dropdown-item mt-2" do %>
常勤・非常勤求人
<% end %>
<%= link_to hospital_manage_spot_job_templates_path, class: "dropdown-item mt-2" do %>
勤務票
<% end %>
<%= link_to hospital_manage_spot_job_templates_path, class: "dropdown-item mt-2" do %>
メッセージ
<% end %>
</ul>
</div>
</ul>
</div>