Create new sections, for Custom HTML.
Use something like
<span id="anchor_a"></span>
Slide them just above the section you are moving to, and target those with the links 
Topic summary
Adding anchor links to specific Shopify “sections” so nav or buttons scroll to a target on the same page. The OP initially looked at settings_data.json but was advised anchors don’t go in JSON; use a Custom HTML/Custom Liquid section instead.
Suggested method:
- Insert an element with an id (e.g., ) directly above the target section via a “Custom HTML/Custom Liquid” section, then link to #anchor_a from menus or buttons.
- Place and reorder sections in the Theme Customizer; “above the section” refers to the section order in the left sidebar. If the theme lacks such sections, anchors may need to be hard-coded.
Update: The OP on Turbo (Out of the Sandbox) updated their theme and gained a Custom HTML section, enabling the approach.
Open issues:
- Non-coders asked for step-by-step placement; guidance remained general.
- Dawn 2.0 users reported no Custom HTML option and that links like #Anchor_Name_here did not scroll to the inserted anchors. Attempts to add anchors via index.json and link from a “Shop Now” button also failed.
Status: No confirmed resolution for Dawn/index.json; an offer to collaborate was made.
Notes: JSON = data files for templates; Liquid = Shopify’s templating language; anchor link = URL fragment starting with #id.