Allowing websockets over https for local server

I need some direction for projects i made. I have an existing node-red in local server that send data using websocket to my domain in my hosting. Everything is working fine over http but the problem occured when i used https for my domain. I used websocket ws: before then i changed it wss: to work over https but it still did not work because i realize i need SSL certificate for my local server too. Then, I used self-signed certificate for my local server. It works but i have to manually input my local server DDNS in my browser to allow wss first then back to my hosting domain, i can't expect the users to do this.

I used DDNS on my local server because i have no static IP. I try to call for my ISP for provide static IP but it can't be done in the near future. Because i have no static IP i can't register domain and i can't use CA Certificate for local server SSL.

My question is:

1. Is there a way to allow ws to work over https?
2. If not, is there a way to allow unsafe wss on my domain page over a button or a prompt when user go to my page? so user don't have to manually input my local server DDNS.
3. Or other way you may suggest.