Thank you for posting query in Microsoft Q&A Platform.
Try to get the list using azure function or custom activity and then pass that list to
ForEach activity. Inside ForEach activity, use the sharepoint online dataset. ForList Nameproperty use Enter Manually and have to dynamic content there to pass every sheet name from Foreach loop.
Hope above helps. Please let me know if any further queries.
Please consider hitting Accept Answer button. Accepted answers help community as well. Thank you.