You can achieve that by applying directly bootstrap classes in your view definitions as outlined in the following snippet ==> my_view.xml:

To solve your specific problem you can build a qweb-template which inserts tags needed for the accordion (accordion-items) at the proper places in your view definition.

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Comment: 

Sorry, but I can't give a snippet, cause xml tags not working in this editor! Best have a look at the bootstrap documentation for accordion. You can copy/paste code samples from there