i want to ask you if there is any option to retrieve all MB Blocks on specific site by some javascript function. Or some function in which i send content of site and it parsed that to MB Blocks as js objects.
Unfortunately, there is no option to retrieve all MB Blocks on a specific site. You need to contact an expert developer who can help you to create the custom code to do that.
We use PHP code to create the custom blocks easier so use JS code to change the properties of a block is not possible.