AFAICS the Q2A data structure for the question list contains only the titles, not the content of the questions. The code for displaying question list items already seems to have provisions for displaying question content along with the title, though, so you could probably override q_list_item() (or q_item_main()) in your theme to add the content to the item data structure:
$q_item['content'] = qa_db_read_one_value( qa_db_query_sub( 'SELECT content FROM ^posts WHERE postid=$', $q_item['raw']['postid'] ) );
However, including question content in the question list will automatically clutter the list, making it harder for people to browse. If you must do it (which I don't recommend), you should at least limit the length of question content displayed in the question list:
$content = qa_db_read_one_value(...); $q_item['content'] = (strlen($content) > 150) ? substr($content, 0, 147) . '...' : $content;
You can consider my plugin but its paid
[Update v1.1] New Paid Plugin Release - Question Content in Question List with Image
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