Support Let's Encrypt ISRG X1 Root CA

When connecting QuickSight to databases, it’s recommend to use SSL. QuickSight doesn’t accept certificates that are self-signed or issued from a nonpublic CA. There is a list of "public CA"s which contains most well-known ones. But I am curious why Let’s Encrypt ISRG X1 Root CA is not included. Nowadays, many DBaaS platforms and self-deployed databases are using ISRG X1 Root CA and it’s widely adopted.

Is it possible to add this CA cert to the trust list of QuickSight?

I’ll mark this as a feature request!