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The draw.io Diagrams for Confluence plugin is a plugin developed by another company, and draw.io depends on the page context in which the diagram is defined. We do not have any insight into that dependency or control over it.
Therefore, you CANNOT it is not possible to enable the parameter “Use MultiExcerpt Include Page Context” in a MultiExcerpt Include macro that is used to include a draw.io macro:
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But I Need to Render the Included Content in the MultiExcerpt INCLUDE Page Context
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We recommend you put Draw.io diagrams in ME macros on pages that are normally accessible by any user who needs to use ME-Include to include them. One cannot put the Draw.io diagram in an a MEEP and have that somehow override the permission checks in the Draw.io application.