LineageOS 18.1 including microG is not available at the moment (cause there is no official LineageOS 18.1 for FP2 ). But there is a way to enjoy LineageOS 18.1 + microG:
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Install unoffical LOS 18.1 according this thread: Lineage-18.1: Unofficial test build
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Install latest Magisk Framework from Github (Installation Guide).
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Enable Signature Spoofing and install microG according this Guide from XDA.
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Enjoy LineageOS 18.1 with working microG.
I tested several apps like Flinkster and for me it works quite well.