How to set up a Local site to use CA Cert with cURL?

I have a site set up in Local, and I’m working with some APIs that need to work over HTTPS using cURL.

I’m supposed to be able to edit the php.ini file, but I’m not sure how to write the path for it. The format for the setting is:
curl.cainfo = "absolute/path/to/cacert.pem"

I’m not sure if that path needs to be set in context of the VM, or my OS? I haven’t been able to get anything working yet.

I’m editing the php.ini file located in the config folder created by Local (/conf/php/7.0.3/php.ini).

Thanks in advance for any help.