Feature request: Parse x509 certificates to JSON

**Is your feature request related to a problem? Please describe.**
When parsing an X.509 certificate, it's convoluted to extract certain parts of the certificate contents.

**Describe the solution you'd like**
When parsing a certificate, I would like the output in a structured data format like JSON.

**Describe alternatives you've considered**
Extracting the required information via regular expressions.

**Additional context**
After parsing into a structured format, it's more convenient to get the required data by JPath/XPath expression.

The issue does not name a file, test, or existing entry point. Start by locating the current X.509 certificate parsing operation and determine how parsed fields are represented; done means the operation returns structured JSON containing the requested certificate data and has coverage for representative certificates.

Written by the indexing model from the issue text.