I might be misunderstanding what you are asking
WebTags are url’s – they direct someone outside of the program.
Now outside of RM program you might able to accomplish something like that with SQLITE
Confirming request has been reported to development.
If you are sourcing each of the royal houses you could add the WebTag to the source. You can add a citation to multiple people under the Sources page, citation 3 dot menu. Another option is to create a Task for the Royal Houses and then add WebTags to it for each house. It will basically keep your bookmark in Tasks when you need to visit the sites.