This simple example datapack provides the basic structure to use Server Sided Portals to create a custom dimension, in this case a copy of the Overworld, and define a block tag for the portal frame that allows traveling to said dimension, in this case portals can be made from Crying Obsidian.
This datapack can be easily downloaded either as a ready to use archive file (.zip) or as source code to be freely customized.
If you find any issue with this datapack example, please open an issue on Server Sided Portals by using this link.