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I haven't actually used it except with a proper work profile set up by an employer - the Island app @aggi mentioned is probably a better bet than the test proof-of-concept. Same idea though!
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Er you can do this natively on Android without any apps:
https://support.google.com/work/android/answer/6191949?hl=en
Edit. If your employer isn't providing an account there's no way I would be accessing work stuff on my phone.
Download all the photos to your phone, disconnect the work account, and then delete the photos from the work account in a browser?
If you want to add a work Google account to a personal Android phone in future and your employer doesn't provide a managed work profile, you can create your own with the Test DPC app. Just create a new profile and add the work account in there.