Thanks a lot, Kovid and all developer.
With Calibre 3.34 I get the comment manipulation within the plugboard.
My tests are succesfull
I like to show my entry:
on {date} loaded at {#download_at}<br>{tags}{series:|, | } {series_index:|[|]} with {#pages} Pages <br>{#author_book_count} {#author_book_count:'first_matching_cmp(1,$,'Books ','Book')'} from this {#fivestarautor:'test($, '5*', '' )'} Autor<br><br> {comment}
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