Maybe.....I can have a go at a theoretical based on some assumptions.
Assumptions:
Create an Employee issue type and a set of custom fields that align with mandatory field to create a new account within AD (or whatever you use), let's say;
(you get the idea)
Then you could either hook this up via API to send the info to be consumed by AD or make use of an automation rule (in Jira) to send the relevant issue data via an outgoing webhook (via the Send web request action)
Then there would need to be work done on the AD side to consume the data and automatically create the new account.
The devil in the detail being, then add to them to which groups? Do you have role based access (in which case they would need to be loaded and maintained in Jira), What about security (on the Jira end) to control who can create these employees?? How is onboarding done currently and who has the capacity to create such an integrated and automated set-up??
I've only scratched the surface, but in my mind it is very doable, but how big a piece of work, thus much mush time and money it would cost is over to you and your teams/dept/organisation