Ура! Решение найдено! Спасибо Олегу!
Вот вам пример, можете у себя потестить.
PlantUml
@startuml
!NEW_C4_STYLE = 1
!include https://raw.githubusercontent.com/plantuml-stdlib/C4-PlantUML/master/C4_Container.puml
AddElementTag("v1.0", $borderColor="#d73027")
AddElementTag("v1.1", $fontColor="#d73027")
AddElementTag("backup", $fontColor="orange")
AddRelTag("backup", $textColor="orange", $lineColor="orange", $lineStyle = DashedLine())
Person(user, "Customer", "People that need products")
Person(admin, "Administrator", "People that administrates the products via the new v1.1 components", $tags="v1.1")
Container(spa, "SPA", "angular", "The main interface that the customer interacts with via v1.0", $tags="v1.0")
Container(spaAdmin, "Admin SPA", "angular", "The administrator interface that the customer interacts with via new v1.1", $tags="v1.1")
Container(api, "API", "java", "Handles all business logic (incl. new v1.1 extensions)", $tags="v1.0+v1.1")
ContainerDb(db, "Database", "Microsoft SQL", "Holds product, order and invoice information")
Container(archive, "Archive", "Audit logging", "Stores 5 years", $tags="backup")
Rel(user, spa, "Uses", "https")
Rel(spa, api, "Uses", "https")
Rel_R(api, db, "Reads/Writes")
Rel(admin, spaAdmin, "Uses", "https")
Rel(spaAdmin, api, "Uses", "https")
Rel_L(api, archive, "Writes", "messages", $tags="backup")
SHOW_LEGEND()
@enduml
