Inspired by @quachpas’s solution and this post from @Andrew, figure can be redefined to include a custom field:
#show figure: set block(width:100%)
#show figure: set figure.caption(position: top)
#show figure.caption: it => align(left)[
*#it.supplement
#context it.counter.display(it.numbering)#it.separator*\
#emph(it.body)
]
#let figure(note: none, body, ..args) = std.figure(..args, {
body
set text(size: 10pt)
set align(left)
[Source: ] + note
})
#figure(
rect(width: 5cm, height: 5cm),
caption: [A picture of a panda],
note: [trust me], //<- custom field
)
I’ve replaced image(...) with rect() so the example would compile.
