The only way to display the registrant count on the LP is to use a webhook to maintain the count; it can be maintained in a separate service or as a field on a special lead called a Resource Lead (a lead that collects aggregate statistics for a program). I gave an NYC MUG talk on the latter approach in 2018, please search for it. (I personally use the former approach, as we have access to a counter service designed for this purpose.)
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