We have an app for that!
The Drawio app let's you integrate drawio with Nextcloud!
@drawio is an open-source flowchart and diagram maker 💡 #AppTuesday
apps.nextcloud.com/apps/drawio
Draw.io - Apps - App Store - Nextcloud
The Nextcloud App Store - Upload your apps and install new apps onto your Nextcloudapps.nextcloud.com