Add back button

Is there a way to add back button limited to PWA version?

Using

<meta name=”apple-mobile-web-app-capable” content=”yes”>

Recently I testing PWA mode. But sadly my site is crippled because there is no back button or swipe back gesture. This should be possible using that meta tag. But I’m not sure what code and where I should place it without breaking my site. Preferably it appear at left side, counter to menu “burger” icon.

Thank you.

The page I need help with: [log in to see the link]