'Is it possible to add notes to an rmarkdown html document AFTER knitting?

I am knitting a html markdown file for a customer with plenty of interactive visualizations inside it.

My client - not a tech user - would like to add their own comments, conclusions to the document, and using it for a presentation.

Is it possible to add a text box to an rkmarkdown html document that can be edited and saved by a non-technical user?

What alternatives I have to keep the document interactive but editable after knitting?

I would like to avoid the case that the customer just copies screenshots from my html and pastes into a ppt.

html r r-markdown

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