There is this press statement from MSI (non english site) saying they will add EXPO support to z690 motherboards via their iEXPO feature english site talking about that press statement
On MSI's z790 product page they say the following under "PERFORMANCE -> XMP and iEXPO Profiles":
MSI Z790 motherboards support Intel® XMP and iEXPO Profiles, which let users overclock compatible DDR4 and DDR5 memory modules to enhance their performances. Users can acquire the right tuning setting in BIOS and boost memory frequency with certified tests.