The LineageOS Project supports the LineageOS Android Distribution LOS 16.0 for Samsung Galaxy S5 Plus (kccat6) since August 2020. accordingly local_manifests / roomservice.xml are available.
Unfortunately TWRP 3.2.3-0 from July 2018 is not quite as fresh as it used to be, but it works.
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Thank you @itsclarence for investing knowledge and time to build an up-to-date /e/ OS ROM for this great device. The next update may already contain the microG Services Core version 0.2.12.203315 ;-))