Hey there. After doing a little bit of research, it appears that at the time of writing, Fidelity does not offer a Javascript widget. Please note that you may want to contact Fidelity about this as a feature request, but you must specify that it needs to be Javascript, as our Website Builder currently only supports adding custom Javascript code. Please also note that using custom Javascript & CSS code requires a Pro plan or higher.
If you have any further questions, please feel free to contact us via live chat or email at any time.