How to get the link/reference of a "Requirement" and "Testrail: Cases" from a JIRA entry via python API?

When using JIRA with TestRail and Confluence you can link a Requirement to a ticket and you can link a TestRail Test Case to a JIRA ticket. For example:

Now using the JIRA python module it is possible to get the ticket details using a code like

from jira import JIRA
myjira = JIRA(server="https://my.jiraserver.com/", basic_auth=(username, password))
issue = jira.issue("PROJ-1")
print(issue.raw)

and print all the details of the ticket. Unfortunately, there is no mention of the linked requirement "DALEX-REQ-001" or the TestRail TestCase "C155535"!

How can I use the JIRA API to get these two fields for the Requirement and the TestRail TestCase?

As it turns out, the references are used in JIRA by a tool/plug-in named "Yogi". There is a reference for these """Yogi""" requirements HERE.

Then you have to guess how to create your query, and the following code does in deed finally return requirements information associated with a ticket:

import requests
from requests.auth import HTTPBasicAuth

# Username and Password
username = "your_username"
password = "your_password"

# Headers
headers = {
    "Accept": "application/json",
    "Content-Type": "application/json"
}

# Complete JIRA URL
jira_url = "https://my.jira-instance.com/rest/reqs/1/issuelinks/TEST-2619"

# Make the GET request to fetch issue details
response = requests.get(
    jira_url,
    headers=headers,
    auth=HTTPBasicAuth(username, password)
)
print(response.json())