[Inf-IT DAVcl] additional external ics resource in infcloud config file

Is there a way to add an additional external ics resource in infcloud config file? I'm thinking about a static ics read-only calendar, such as holidays calendar: https://www.data.gouv.fr/fr/datasets/le-calendrier-scolaire-format-ical/#res... (french school holidays calendar) Thanks for your answer.