Unfortunately, this isn't something that JIRA Cloud can do at the moment.
In the Atlassian Marketplace, there is the Confluence Cloud version as you have mentioned but not for JIRA at the moment.
We've been tracking a similar request here JRACLOUD-10465 but it was closed as we do not have any plans to implement the feature.
There are other specific request in the tracker which are still open which might interests you:
Alternatively, you may find it easier, or be more likely to guarentee success if you engage an Atlassian Partner.
Hope this helps,
We have just released an electronic signature plugin for JIRA Cloud. Would appreciate your feedback on it if you are still looking.
I wanted to mention that our team at RadBee released recently Speedy PDF Sign-Offs for Jira Cloud, which is designed to answer this need. In a nutshell, this is what Speedy does:
The App is free, so you can easily check it out. (there is a short demo video too: https://www.youtube.com/watch?v=Cg2EaF5OrDo&t=3s )
Its' very new, so we welcome any thoughts and input.
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