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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
I just wasted a few hours of my life scanning the Ledger Live code base. And sure yeah it's open source and clonable as you can see here https://github.com/LedgerHQ/ledger-live it's also pretty much updated as the last merge to develop is 19 hours ago. So first off the firmware is proprietary meaning not open source and normal people won't have access to it. So there's no freaking way to confirm nor debunk what the comment OP see IN A TREZOR SUB unless you can hack into the Ledger device memory one way or another but that requires hardware and firmware knowledge that I don't have nor a majority of software developer.