To be sure of understanding, you want to create a link between 2 Jira tickets from miro.

So via "jira" plugin to have 2 miro cards linked to 2 tickets in JIRA and in miro allow to add in a card a reference to the other.

I don't have the answer to your question but on the other hand, I can draw attention to the fact that there are several miro plugins - JIRA

And you have to pay attention because some are not for all jira solutions.

Jira software Server being abandoned by Atlassian, plugin editors focus on Jira Cloud.

IE https://help.miro.com/hc/en-us/articles/360017572414-Jira-Add-on?backUrl=%2Fmarketplace%2F
 

Hello @Christophe GESCHÉ ,

Thanks for your answer.

I have 2 cards in miro. I want to create jira item for those 2 cards and also link both of them in jira