Is there any way to set a Resolution post function to resolve based on user choice?

Question

My company wants to set the resolutions based on how tickets are closed (think done, cancelled, fixed), however we want to have all the tickets still going to our "Done" status on our workflow. 
As it stands, I can only make the post function that sets resolution be a single choice of the resolutions we have on our list, with no way of letting the user pick which resolution it is. 
I tried setting up a custom transition screen that lets them select the reason for closing the ticket and put it into the transition to "Done", but there doesnt seem to be any way to set the Resolution of the post function to this status. 
The only other option I can think of is having every Resolution be it's own status in the workflow, and having the user pick out which one when theyre moving the ticket, but that seems messy and not as clean when going through our tickets.

Is there any way to set the post function resolution to be not a singular value and instead change with the option the user selects with the transition screen? Is there any effecient way of setting the resolution to be dynamic? Thank you for any help!

Tobias Ravenstein_eeoi4j · Answer

Also checkout this post https://community.atlassian.com/t5/Jira-Software-questions/Can-I-restrict-the-resolution-choices/qaq-p/803372 to limit the choice of resolutions on the issue screen if you have more resolution than done, cancelled, fixed.

Nic Brough -Adaptavist- · Answer

Ok, so it's simply this bit: " Is there any way to set the post function resolution to be not a singular value and instead change with the option the user selects with the transition screen? "

Yes, you do what Jira does off-the-shelf - make sure there is a transition screen and put the resolution field on it.

This lets the user select the resolution they want, and enforces that they put one in.  You don't need post functions or other fields