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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.
https://github.com/swimlane/ngx-charts is pretty good - BUT - I would actually recommend just making a D3 line chart from scratch if this is going to be a long term project. Just because you will have a lot more freedom and flexibility. The lib above is good but it has a hard time keeping up with the latest Angular releases, so you won't be able to ng update as frequently as you want, and you'll probably find yourself spending time hacking it for custom looks or functionality. Might as well spend that time learning D3, IMO.