@Kothai Ramanathan Thanks for posting your question on Microsoft Q&A.
Unfortunately using managed identity to connect to Azure Data Factory is not possible while invoking Data Factory from Azure Logic Apps. You can post your feedback on Uservoice so that community can upvote and helps products team to prioritize this feature into their future release plans.
Please do not forget to "Accept the answer" wherever the information provided helps you to help others in the community.
Thanks @Kothai Ramanathan
@Saurabh Sharma - one related question to this. If I trigger the pipeline run from logic apps using the Http action with the REST API, at that time, can I use a user assigned managed identity in the authentication of the Http action ?