Magento 2 CMS is generally liked to run web-based organizations in different specialties.
As the CMS is adaptable for customization, present-day business necessities can be effortlessly satisfied. One such model is to add custom field in checkout page Below Payment Method List Magento 2.
This post shows the automatic answer for something very similar.
For instance. If you really want the client to concur with something separated from the default Magento 2 agreements, you can carry out a custom checkbox.
Or on the other hand, you can add the gift wrap checkbox utilizing the underneath code. To urge the clients to give some sum with each buy, you can add a checkbox field which when the client will tick, a decent sum will be added to the truck completely naturally.
For more info: https://meetanshi.com/blog/add-custom-field-in-checkout-page-below-payment-method-list-in-magento-2/