Benjamin,
Hope all is well. Unfortunately, I do not have any template, but if I may help with some advice here. Firstly, include a short introduction - your name, organization, together with relevant social media links/website. Secondly, explain in few sentences - Why do you want this celebrity to be guest on your podcast channel, as well as - brief overview of the topics you would like to discuss. Try to do the detailed research and find out what would be the meaningful topics that your guest would be more that happy to share the experience on. Hope I managed to help you!
Have a good one!
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