Hello! This is an interesting plugin. I was testing it and was getting some errors in WordPress block themes I wanted to advise you of:

• echo was causing the shortcode to output the content above the header (at top of body) in the rendered front-end page. i ran it thru cursor to fix and it appears in the correct place now
• this issue was also causing the error “Publishing failed. The response is not a valid JSON response.” when trying to save the page in the wp-admin. fixing the echo issues seems to have fixed this issue also