If you are looking for specific for this 720p version, you might check community-driven subtitle platforms like OpenSubtitles or Subscene, as they often host fan-made and official rips for specific file releases.
Queen Elizabeth II (using archived speeches and private recordings) Key Highlights of the Footage subtitle Elizabeth.The.Unseen.Queen.2022.720p.W...
described it as "sweet and moving," though noting its "valedictory air". If you are looking for specific for this
The earliest known footage of the Queen as a baby in a pram in 1926. subtitle Elizabeth.The.Unseen.Queen.2022.720p.W...
The film was compiled from over 400 reels of previously unseen footage. Some of the most notable moments include: