You can just share the note as a link. Anyone can click & open in a browser. This is a good method of nudging people towards Nostr. I do it all the time.

nostr:nevent1qvzqqqqqqypzq3ln8sv3a3w2q0yz70jaz3ecfcpgkvfxgzw2htcpvj0qr7dknd4rqy2hwumn8ghj7un9d3shjtnyv9kh2uewd9hj7qgwwaehxw309ahx7uewd3hkctcprdmhxue69uhhyetvv9ujumn0wd68yurvv438xtnrdakj7qpqe3d8kpg6ecxlx58sp26fezgh670xrarjj22uuwrr860xcu8fex2s8xunqa