My caliper rotor push oil back in the STI. All of the sudden mineral oil started leaking.
Do you know SKU of this part?
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According to the ST-7020R exploded diagram at https://dassets.shimano.com/content/dam/global/cg1SHICCycling/final/ev/ev/EV-ST-R7020-4341C.pdf
That part doesn't exist as a removable part, hence why you need to confirm your exact shifter part number.
For completeness - the dealer manual is at https://si.shimano.com/api/publish/storage/pdf/en/dm/RADBR01/DM-RADBR01-07-ENG.pdf and a browse through shows no mention of removing that plate.