I took a look at imgbb's API docs, and suffice it to say, they are lacking and sparse, with little information on how to work with it. It says it should be able to be called with GET requests, but zero info on how to actually do that. I don't see album as a field in the API response either, so it might not be possible.

However, I think I can come up with a workaround if you're willing to go to "Embed codes" and go to the "HTML Full Linked" option in the dropdown for an album. I might be able to whip something up to automatically strip the irrelevant code tags and get the direct image link, which can then be put in. Would that work?