I am afraid currently it is not available for the Create HTML table Action to specify which elements, replace the elements or applying the table stylesheet.
For now the create HTML table Action only have one Advanced option, which is include the include Headers.
For specify elements, we need to do that in the previous Action through the OData Query, such as SQL -Get Rows or SharePoint - Get Items. Please note that not all the Action would support OData Query, and not all OData query function would be supported in the supported Action.
For example, SQL server -Get Rows, would support the Filter query, OrderBy, and the Select Query, but for SharePoint -Get Items, it only support Filter query and the OrderBy.
Regarding documentation, for Microsoft Flow, well, currently there is not enough documents that could be referenced for each Action, as Microsoft Flow is built on top of Azure Logic App, you may take the corresponding Connector document in Azure Logic App as a reference.