How to add a custom text below the «Discount» value on the frontend cart and checkout pages?

Is there any way where we can put below “Discount” text dynamic ?

<item name="title" xsi:type="string" translate="true">Discount</item>

actually , i want to give a system config option where user can select text from dropdown and that value will show instead “Discount” on cart and checkout.

See: How is the \Magento\Checkout\Block\Cart\Totals (checkout.cart.totals) implemented inside the «Summary» container on a frontend cart page?