Open your model in Matterport Studio (Edit view), click the Mattertag icon in the left toolbar, then click Add Tag and place tags on surfaces in the 3D tour. Label each one to match your hotspot ID (HS1, HS2, …) and save. We'll read the positions automatically, no extra files needed.
Already captured 3D coordinates? Paste the JSON below. Otherwise leave it blank and tick "I need help identifying hotspot positions" at Step 6 — we'll capture them for you.