HTM5 has a <progress> element, which can be used in Webflow using custom code;
This demo is creating progress bars using HTML5's <progress> element. In the collection are both a progress amount, and a max amount, from which the progress bar is created.
The styling of the progress bar is done in the designer, and you can see this e.g. in the Style Guide at the bottom of this page.
Click the View in Webflow's Designer button at the top of this page, to explore the page design.
Pay particular attention to the scrollbars, and the CSS Embed at the top of the demo area.