Colour-magnitude diagrams containing the 28 high-confidence optical counterparts found in this study. From left to right, (m_F225W, m_F225W−m_F275W), (m_F555W, m_F390W−m_F555W), and (m_F555W, m_F555W−m_F814W). Orange points indicate counterparts exhibiting evident variability, while green points denote objects for which we found an Hα emission. Additionally, blue counterparts indicate those occupying interesting positions in the CMD. Red counterparts are the only counterparts found within the uncertainty radius of their respective X-ray source. Squares indicate those counterparts that we find in common with Kumawat et al. (2024).