Hi @Andrew Lazare and welcome,
Jira allows to link existing Jira issues to another entities (another issue within the same or a linked Jira instance, a confluence page, an external site,...) as depicted within the documentation page at here https://support.atlassian.com/jira-software-cloud/docs/link-an-issue/
Probably the best think you can do is to follow the 'To a specific URL' section at the above page to manually link related entities at both apps. Note that you cannot do this within the new issue view as the warning on the above page says.
Additionally, you can create this links using REST Calls if you want to go further an automatize the process, see also: https://developer.atlassian.com/cloud/jira/software/rest/api-group-remote-links/#api-group-remote-links
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