Webpixel app extension can be run the gtm code or javascript code?

Technical Q&A
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hi I am building the web pixel app extension can be run the gtm script code like third party js code in the app pixel.

how to migrate script_tag or theme app extension to the webpixel ?

  1. can I write any js code in the js files ?

  2. what are limitation for web pixel ?

  3. Facebook pixel can be work with app pixel ?