Where can automations (like validation checks) be linked to, on a change request

[AB]

Hi,

My question is regarding where on the screen or how early in the process of building a Jira Change Request, could an automation be linked.

For example, we have a button for "Submit For Approval" within the main bar of commands like Edit / Comment / Assign / More / Cancel .

1) When we click this button can we have an automation / validation run to check a few things?

2) Or, we have to click this button, fill in the subsequent screen, and click on Submit for Approval again and this is where the automation / validation would be run?

My preference would be to run it earlier in the process, so (1) above, and I am wondering if this can be done.