Hi @Gavin ,
unfortunately Jira Work Management is only available on the Jira Cloud version. It's not possible to add it to on-prem versions. You can have a look at the Atlassian documentation here : https://www.atlassian.com/blog/announcements/introducing-jira-work-management#:~:text=Jira%20Work%20Management%20is%20available%20for%20everyone%20today&text=All%20project%20data%20and%20settings,Jira%20Work%20Management%20for%20free.
Let me know if this helps,
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