Defaulting values from Job DFF to Union field in Position

Summary:

Hi
We have a requirement in which we need to create a DFF on Job page for union and then flow that value to the position which has that job. So basically on Position page the union field should get populated based on selected job. Just wanted to check if anyone has done that in Redwood, and even if it's feasible? also in case if defaulting is not possible can we atleast do validation on this?

Content (please ensure you mask any confidential information):

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):