The Mosaico CiviCRM Integration extension includes a base template that provides several different types of blocks to use in composing emails.
I need a type of block that's not included in that base template. My block type would contain a name (editable text) on the left, a signature (uploadable image) below the name, and a logo (uploadable image) to the right.
How can I create this custom block type, and make it available in my templates?