Is it possible to send email form data by javascript and html only?

If any of my friends know how and can help me, I need to send the contact form data via Javascript, the reason is very simple.
I can host static websites for free using Cloudflare and Github, I can also create institutional email for free like Zoho.
Github doesn’t run PHP, but it runs Javascript.
I have the possibility to use Formspree or another, but I would like to have an option without using more external resources.
If any friend knows how to do it and can share my thanks.

Smart Forms does this. Maybe you have requirements that prevent you from using it?

Smart forms works perfectly, but I would like one that I could freely customize, to receive the email without the smartforms fields. receive the personalized message.

I use works perfectly and you design your own forms. Just paste in a single line of code.