@joeyk Thanks for your reply. I was looking for something that can work within the mautic for custom blocks. I think this link works for website or for external sources not for mautic instance.
Please help me if this tutorial can be used along with mautic instance.
Mautic uses grapesjs as email builder.
It’s a third party vendor basically.
In order to add new blocks to the grapesjs builder you need to modify the grapesjs builder.
I hope that makes sense.