If you use a tag management platform like Adobe Launch, Google Tag Manager, etc. then you could load the tracking JS via it, but if not, then you'd have to hard-code the tracking JS on your LP templates (add it in the <head> so it loads first). Additionally, for your reference, loading tracking JS via a tag management platform adds an additional header/latency as the scripts within it are loaded after it itself gets loaded, but on the other hand, it waves off the need to hard-code the tracking JS on every single template.
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