Go to Emailjs and create a new template. You can use the following code as a starting point.
<p> </p>
<p>You got a new message from {{name}}:</p>
<p>Date: {{submittedAt}}</p>
<p>Email: {{email}}</p>
<p>Subject: {{subject}}</p>
<p>Date: {{date}}</p>
<p style="padding: 12px; border-left: 4px solid #d0d0d0; font-style: italic;">
{{message}}
</p>To add your data to the website, you need to edit the files under /src/assets/json/*. The files are self-explanatory, and you can add your data there.