[keycloak-user] additional realm properties in theme

Hi, I would like to design a theme that has dynamic properties depending on the realm. Each customer would get their own realm but still use the same theme. Is it possible to add additional fields to the realm (i.e. the customer address) and use them in the templates? For example, emails should contain a footer with the customers address and contact details. Or is it possible to load an external properties file from the filesystem? Like „/opt/keycloak/themes/mytheme/common/customer1.properties“? Thanks in advance! Gregor