This thread is trying to answer question "What's the best way to simulate pasting into a text field?"
also, the answer to this might depend on what you're trying to do/test and how the fields you're interacting with behave.
Without more concrete context, I'd say start by copying the contents that you want to the clipboard, focusing on the field that you want and issue
CTRL+V or the equivalent of the OS you're on, then validate the content on the field.
Similar to what is described here: https://github.com/microsoft/playwright/issues/8114#issue-964733495
I think this issue is relevant https://github.com/microsoft/playwright/issues/15860
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