How to display timeline json files in Tensorboard

Used the tf.profile.with_timeline_output (TF 1.15.2) to generate timeline json files ( using Keras is not an option) . These files are viewable in chrome. However Tensorboard says the following. What needs to be done to make them viewable in TB ?

No profile data was found.
If you have a model running on CPU, GPU, or Google Cloud TPU, you may be able to use the above button to capture a profile.
If you’re a CPU or GPU user, please use the IP address option. You may want to check out the tutorial on how to start a TensorFlow profiler server and profile a Keras model on a GPU.
If you're a TPU user, please use the TPU name option and you may want to check out the tutorial on how to interpreting the profiling results.
If you think profiling is done properly, please see the page of Google Cloud TPU Troubleshooting and FAQ and consider filing an issue on GitHub.

https://stackoverflow.com/questions/tagged/tensorboard

Environment information (required)

No problem with TB - it shows graphs, scalars, etc.

Steps to reproduce (required)

Any plain TF code ( non-Keras)