How to apply SLA changes to already closed issues?

Question

JIRA

We set up SLA in JIRA, but at the time of entering the data, we made a mistake with the time of one of the statuses.
After changing to the correct time - how to apply this change in all closed issues?
There is also a situation that the task was initially started with one priority, but in the process of implementation it needs to be increased or decreased. We do this in the task itself, but the SLA is not recalculated for the new priority.