If you open the Word document in eaDocX, in the eaDocX menu there is a ‘Options and Settings’. This controls, amongst many other things, which Word styles are used for which bits of generated text.
The ‘Inline’ bit determines which Word styles are used for regular paragraphs and headings, and the ‘Tables’ bit does the same for tables. So, you can choose your own styles to use for the text which follows a heading.