I found the code below in this forum. I would like to set a fall-back image in the assets folder for those page bundles without the cover.jpg image. How to do that?
{{- with .Resources.Get "cover.jpg"}}
{{- with .Fill "300x192 webp "}}
<img src="{{ .Permalink }}" alt="{{ .Title }}" width="{{ .Width }}" height="{{ .Height }}" loading="lazy"/>
{{- end }}
{{- end }}