Images in HTML editor : restrict to newsletters

[sdelcroix]

Is your feature request related to a problem? Please describe.

Maybe I missed a thing but I didn't find how to restrict the ability to use images in HTML editor only for newsletter fields.

Describe the solution you'd like

When activate Images in HTML editor, I'd like to be able to add a constraint to newsletter fields only.

Describe alternatives you've considered

None.

Additional context

None.