Yes, most LG TV is compatible with HBO. Below are the list of 4K Compatible LG TVs and the webOS version. Presently, HBO Max is supported on webOS 4.0 and above TVs (2018 and later models*) Check your own LG mode.
OLED
OLED65R1PUA, OLED88ZXPUA, OLED77ZXPUA, OLED77G1PUA, OLED65G1PUA, OLED55G1PUA, OLED83C1PUA, OLED77C1PUB, OLED65C1PUB, OLED55C1PUB, OLED48C1PUB, OLED83C1AUA, OLED77C1AUB, OLED65C1AUB, OLED55C1AUB, OLED48C1AUB, OLED77B1PUA, OLED65B1PUA, OLED55B1PUA, OLED77A1PUA, OLED65A1PUA, OLED55A1PUA. OLED48A1PUA, OLED77A1AUA, OLED65A1AUA, OLED55A1AUA, OLED48A1AUA
4K UHD
86QNED99UPA, 75QNED99UPA, 65QNED99UPA, 86QNED90UPA, 75QNED90UPA, 65QNED90UPA, 86NANO99UPA, 75NANO99UPA, 65NANO99UPA, 86NANO90UPA, 75NANO90UPA, 65NANO90UPA, 55NANO90UPA, 86NANO85APA, 75NANO85APA, 65NANO85APA, 55NANO85APA, 75NANO80UPA, 65NANO80UPA, 55NANO80UPA, 50NANO80UPA, 65NANO77ZPA, 55NANO77ZPA, 50NANO77ZPA, 86NANO75UPA, 75NANO75UPA, 70NANO75UPA, 65NANO75UPA, 55NANO75UPA, 50NANO75UPA, 43NANO75UPA, 86UN9070AUD, 75UN9070AUD, 65UN9000AUJ, 86UP8770PUA, 82UP8770PUA, 75UP8070PUA, 70UP8070PUA, 65UP8000PUA, 60UP8000PUA, 55UP8000PUA, 50UP8000PUA, 43UP8000PUA, 75UP8070PUR, 70UP8070PUR, 65UP8000PUR, 60UP8000PUR, 55UP8000PUR, 50UP8000PUR, 43UP8000PUR, 75UP7570AUE, 70UP7570AUD, 65UP7560AUD, 55UP7560AUD, 50UP7560AUD, 43UP7560AUD, 75UP7670PUB, 70UP7670PUB, 65UP7670PUC, 55UP7670PUC, 50UP7670PUC, 43UP7670PUC, 75UN6955ZUD, 70UN6955ZUC, 65UN6955ZUF, 55UN6955ZUF, 50UN6955ZUF, 43UN6955ZUF, 75UP7070PUD, 70UP7070PUE, 65UP7000PUA, 55UP7000PUA, 50UP7000PUA, 43UP7000PUA