Custom Blocks in Datapacks?

Hello, I know that this is basically about data packets. But I have a project that relies on both data packages and plugin content. The point is that I would like to know whether it would work to integrate custom blocks from the Itemsadder plugin into a Worldgen data package. The blocks should be integrated much more into the world generation. (i.e. placed) I am aware that plugins and data packages are not entirely compatible with each other. However, I would like to know more about whether it would work. Especially because Itemsadder can use note blocks for the custom blocks. I would be grateful for any assistance