The microplane damage output is not directly available in Workbench Mechanical. You would need a command snippet to output that.
"PLESOL, MPDP, TOTA"
Please refer to PLESOL for more information: https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v192/ans_cmd/Hlp_C_PLESOL.html?q=plesol
And here is an example you can try:
! Graphics power needs to be turned on to view the rebars
! Enter /post1 module
! Show result as a png image
! Set the frame as the last substep of the 1st step
! Select the SOLID185 elements
/trlcy,elem,0.5 ! Change them to transparent level 0.5 (0 is solid, 1 is completely transparent)
! Set view angle
! Show the whole section of the reinforcement
! Plot displacement
! Plot damage
plesol, MDPD, TOTA