Same Design for all blocks

I think for the first Point you are searching for normal Components? https://grapesjs.com/docs/modules/Components.html#how-components-work

I did look at the link but it doesn't have what I'm looking for but I really appreaciate your help.

What I'm looking for is something like this:

1. I have a custom UI that generates this code below

img{
    border: 1px solid black;
    border-radius: 10px;
}

2. Now I need this generated code to be applied on all images on the canvas.

Thank you. :)

@froderf it's up to you how to create/maintain a Design System, you can import your classes and them by changing them you will change the design on any component with that class