Hello,
Attributes such as w14:textId or w14:paraId aren't used to set styles but for extended comments and others.
w:left and w:right tags in w:tblCellMar tag are set using padding-left and padding-right styles, you can use them to set both values instead of the default 0. As you are using a Premium license you can also use DOCXCustomizer to customize both values after the HTML has been transformed (https://www.phpdocx.com/documentation/introduction/docxcustomizer).
Regards.