Is it possible to add tags like "CanPlaceOn"? I don't find any info about it.

Hi,
By tags do you mean NBT Tags/Properties?

This section covers it fairly well; https://github.com/RockinChaos/ItemJoin/wiki/Creating-Items#setting-up-nbtproperties
If it is another plugin handling the CanPlaceOn it depends on how they set the tag that you would need to replicate. Examples such as it being nested in a folder such as Item would be Item.CanPlaceOn.

By default though this should work for you, simply add this to your item;
properties: 'CanPlaceOn:DIRT'
Just replace the DIRT with your desired value. (I am not sure what functionality this tag serves so I am just showing an example)

EDIT: Marking as answered due to inactivity, please reopen this issue if you need additional help.