If I call ESP_LOGI in esp-idf I get an INFO-Log which should be displayed in green in moserial.
The color will be triggered by an escape sequence started with 0x1b
1B 5B 30 3B 33 32 6D .[0;32m see Console codes CSI
moserial just displays what is send by the device. It would be fine if it would interpret this kind of sequences.