Come sostituire Let's Encrypt RSA 4096 bit con ECC 256 bit?

Is it enough by editing line 59 & 63 on this file?
And then rebuild discourse?

Editing line 59 & 63 on /templates/web.letsencrypt.ssl.template.yml didn’t work.
My code:

Maybe it will work if I force to renew/generate new cert?
What is the command under Discourse?
Thanks!