These entries are queried from radb.net using whois, you can try my project getting these.
:AS-SAKURA as-set: AS-SAKURA descr: Sakura~ members: AS57175,AS59598,AS9516 admin-c: SAKUR1-ARIN tech-c: SAKUR1-ARIN mnt-by: MNT-SL-2135 created: 2023-02-24T04:15:47Z last-modified: 2023-02-24T04:16:23Z source: ARIN as-set: AS-SAKURA descr: ASs for which SAKURA provides transit members: AS7684, AS9267, AS9370, AS9371, AS12654, AS38074, AS38215, AS38254, AS55897, AS59091, AS59092, AS59105, AS59128, AS62184, AS63771, AS63778, AS63781, AS63791, AS63795, AS63797, AS63806, AS131080, AS140868, AS146980, AS151349, AS151371, AS199266, AS203577, AS205603, AS209306, AS215087, AS216447 admin-c: KT749JP tech-c: JP00072233 notify: peer [at] sakura.ad.jp mnt-by: MAINT-AS7684 changed: peer [at] sakura.ad.jp 20240421 source: RADB last-modified: 2024-04-20T23:29:46Z as-set: AS-SAKURA descr: ASs for which SAKURA provides transit members: AS7684, AS9267, AS9370, AS9371, AS12654, AS38074, AS38215, AS38254, AS55897, AS59091, AS59092, AS59105, AS59128, AS62184, AS63771, AS63778, AS63781, AS63791, AS63795, AS63797, AS63806, AS131080, AS140868, AS146980, AS151349, AS151371, AS199266, AS203577, AS205603, AS209306, AS215087, AS216447 admin-c: KT749JP tech-c: JP00072233 notify: peer [at] sakura.ad.jp mnt-by: MAINT-AS7684 changed: peer [at] sakura.ad.jp 20240421 source: JPIRR