Adding a date & time picker field in a context layout (for ex 'End activity')

Summary: How can we add a date/time picker field in a screen like 'End activity' or 'Edit/View activity'?

Content (please ensure you mask any confidential information): We would like for example to provide a field for our technicians to indicate a date and time that they expect to return to continue an activity. In this example the field would be added in the 'Suspend activity' layout. We want a date/time picker similar to the one used for 'Communication Window Start' and 'Communicated Window End' fields.

I found some posts about this topic but they are a few years old and I didn't see accepted answers for them.