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awesome-selfhosted
A list of Free Software network services and web applications which can be hosted on your own servers
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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 think you are always going to run into problems as most apps store user data in plain text. Even if encrypted as soon as you decrypt your data is going to be processed by the Windows Defender, rendering encryption useless. I personally only see three options here: switch over to Linux, disable the Windows Defender or the use of a web-based note taking app like CryptPad.
Here is a great list which should contain what you are searching for.