Justinmind is an advanced wireframing and prototyping tool that enables users to create prototypes of web and mobile apps without coding.
Official website: https://www.justinmind.com/
You can download Justinmind by going to its official website and clicking on "Download Free" at the top right hand corner as shown in the screenshot below. You will be required to create an account before you can download the installer.
After downloading the installer, run the installer to install Justinmind on your machine.
Out of all the UI tools/libraries that I have evaluated, Justinmind provides the most number of UI widgets for users to choose from. The screenshot below showcases some of the UI components that you can choose from.
Clicking on a UI component e.g. Icons will present you with many different options to choose from.
You can even download and add more UI components if you are unable to find the one that you need.
For each UI component, you can customize the properties to suit you liking.
The screenshot below is a mock investigation board that I created using Justinmind.
As shown in the section above, Justinmind has a comprehensive list of UI components to choose from. Furthermore, there are a number of additional features that have been implemented in Justinmind as well. You can find out more about the features at https://www.justinmind.com/support/. As a result, the learning curve for Justinmind is steeper as compared to other UI tools/libraries. More importantly, because Justinmind is mainly used to create prototypes of web/mobile apps, it is likely that it does not have built-in webhooks. I was also unable to find webhooks during my exploration of the tool.
In conclusion, you could use Justinmind to come up with a prototype of how you want your frontend to look like. However, I do not think that it is possible to port the work done with Wekan as Justinmind does not support webhooks.