PDSCH Config Common Parameter Structure

Hi 5G Experts,
In reference to time domain resource allocation, i have below query:

For sib1 it’s mentioned that can be used to provide an RRC configured lookup table within PDSCH Config Common Parameter Structure.
Can anyone explained these tables?
I seen in structure only mapping type as type A so my understanding is that UE will use standardised default table A only.
Need to understand what this rrc configured look up table.