feat: add metadata for data-placeholder

[jeffreylauwers]

Added metadata for data-placeholder tokens.

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Name	Status	Preview	Comments	Updated (UTC)
utrecht	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 22, 2024 7:06am

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 97.75%. Comparing base (4e53b58) to head (7b0a87b). Report is 21 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2379   +/-   ##
=======================================
  Coverage   97.75%   97.75%           
=======================================
  Files         146      146           
  Lines        1113     1113           
  Branches      223      217    -6     
=======================================
  Hits         1088     1088           
  Misses         24       24           
  Partials        1        1           

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