Example LTI 1.3 Tool with Grading Functionality H5P
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Go to Manage Organization > Connect LMS and Add LMS Connection
Select your LMS: Other
Connection name: IMC LMS (or some other label)
LTI Version: LTI v1.3

Create LTI 1.3 Provider with:
Use the following Login URL: https://im-c.h5p.com/lti/login
Use the following Redirect URL: https://im-c.h5p.com/lti/launch
Once you've made a LMS connection, add the extra data from your platform to the connection

Create LTI media with that provider
Register configuration by Connection info
Create some content under Manage Content
Save the link to the created content (https://im-c.h5p.com/content/1291250754620523077)
Configure media:
Add the saved link to the "Target Link URL" field of the Media
Open media in Preview
Launch media (as learner). The target content will be displayed.