Create new campaign "on the fly" when entering new contribution: custom fields are not supported

Overview

When I enter a new contribution as a CiviCRM Admin user, I can select a campaign - and, when the campaign is not found, I can add a new campaign.

However, the pop up screen for entering the new campaign does not include campaign custom fields - what makes this feature in certain use cases dysfunctional.

Current behaviour

1. Create a custom field for a campaign.

2. Click on Campaigns -> New Campaign: As you see on the screenshot, you can enter something in that custom field

   

3. Now, click on Contributions -> New Contributions

4. Click on Campaigns and (1) enter some non-existent value. Now, you can click on "+" to enter a new campaign (2)

   

5. After Click on New Campaign a pop up opens where you can enter a new campaign - but here, the campaign's custom field is missing:

   

Proposed behaviour

It should be possible to access the custom fields in the same way as with Campaign -> New Campaign

What should happen? How is this better? If appropriate/available, include any wireframes or mockups.