Event images: where should captions be entered?

Hi,

a question for the group: where should captions be entered (so that they can subsequently be placed and formatted via a template)?

These consist of:
Title (subtitle). Photo: Author, Wikimedia Commons, CC BY-SA 4.0
...where "Author" is a hyperlink, and the text itself is, of course, in a "small" font size.

Under JEM > Edit Event: Image, I can select an image.

By default, I cannot add hyperlinks to "custom fields"—unlike in the event descriptions. Do you use custom fields?

thanks for answers,
m.

J 5.4.9., JEM 5.0.1