Suggestion is to provide standard Salesforce components elements from the Lightning Design System as a Miro “App”. It would be used when drafting possible layouts (for example).
Background: Salesforce is a popular CRM system used worldwide. It has an extensive CSS based Lightning Design System including graphic elements. Full details available at https://www.lightningdesignsystem.com/ and/or https://github.com/salesforce-ux/design-system
See also: https://www.lightningdesignsystem.com/tools/sketch/ (unfortunately this is not compatible with Windows PCs so there is a gap in the available tools as far as I am aware.)