If you are interested putting a TLS front end (SSL) onto Blynk, this will be the same with all servers, eg Apache, Nginx, IIS.
You setup a NAT Firewall with reverse proxy to backend servers using pFsense.
Use the ACMECert to get free SSL certificates from Letsencrypt.
This is the most secure, simple (web interface) method to implement SSL websites for Home users. Don't underestimate the security though this is a robust and strong setup.