Since your post pages have the featured image, your theme supports the featured image.
First, you need to check if there is an option for the featured image on your page settings in the page details.
In case of cannot find anything related to that, you could make some changes in the page.php file which prints the page frontend view.
WordPress has a certain standard to print out the featured image and can find the following function (or similar) somewhere in the single.php file.
<?php the_post_thumbnail(); ?>
Insert the missing function in the page.php file from the post single template.
PS: Sometimes duplicating the single.php file into the page.php would be an easier way to implement it except for the parts of only post related things such as category, tag, etc.
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