I have created view as block and in block twig template i can print view fields as content['#view'].field['field_machine_name'].value(row) HOw can i print text in textarea that i set as header and footer for this view.
if you want to display view header or footer in twig template, look at core views-view.html.twig and all the available variables. In your case :
header: The optional header.
footer: The optional footer.
In your twig views-view--[view-name].html.twig, you can display your variable like this :
<p>{{ header }}</p>
