In Power Automate, you could use the div,mul,concat and mod functions to derive the hh:mm:ss format
Say e.g. the milliseconds value is 554666861
You get days by dividing your input by 3600000*24
Which is 554666861/(3600000*24) = 6.419755336 days = 6 days
You get the hours by multiplying the remainder with 24
Which is .419755336 * 24 = 10.07412806 hours = 10 hours
You get minutes by multiplying the remainder of the previous action by 60
Which is .07412806* 60 = 4.4476836 minutes = 4 min
You get seconds by multiplying the remainder of the previous action by 60
Which is .4476836 * 60 = 26.861016 seconds = 26 seconds