57:I[32247,["https://static-next-staging.curseforge.com/_next/static/chunks/0i8ojx2zcexnr.js","https://static-next-staging.curseforge.com/_next/static/chunks/105jx_.nbk6qv.js","https://static-next-staging.curseforge.com/_next/static/chunks/17d_0~y3.zhy0.js","https://static-next-staging.curseforge.com/_next/static/chunks/0g_n93otw.-pg.js","https://static-next-staging.curseforge.com/_next/static/chunks/0.utgg~-o5tzp.js","https://static-next-staging.curseforge.com/_next/static/chunks/0275aot.cmujh.js","https://static-next-staging.curseforge.com/_next/static/chunks/14v0cofhugnj3.js","https://static-next-staging.curseforge.com/_next/static/chunks/11rxnkj3excre.js","https://static-next-staging.curseforge.com/_next/static/chunks/073ysftt0-lp0.js","https://static-next-staging.curseforge.com/_next/static/chunks/0g1yuq9t3-god.js","https://static-next-staging.curseforge.com/_next/static/chunks/0iqch-~c4h.t_.js"],"ScrollToTopOnEnter"] 58:I[13800,["https://static-next-staging.curseforge.com/_next/static/chunks/0i8ojx2zcexnr.js","https://static-next-staging.curseforge.com/_next/static/chunks/105jx_.nbk6qv.js","https://static-next-staging.curseforge.com/_next/static/chunks/17d_0~y3.zhy0.js","https://static-next-staging.curseforge.com/_next/static/chunks/0g_n93otw.-pg.js","https://static-next-staging.curseforge.com/_next/static/chunks/0.utgg~-o5tzp.js","https://static-next-staging.curseforge.com/_next/static/chunks/0275aot.cmujh.js","https://static-next-staging.curseforge.com/_next/static/chunks/14v0cofhugnj3.js","https://static-next-staging.curseforge.com/_next/static/chunks/11rxnkj3excre.js","https://static-next-staging.curseforge.com/_next/static/chunks/073ysftt0-lp0.js","https://static-next-staging.curseforge.com/_next/static/chunks/0g1yuq9t3-god.js","https://static-next-staging.curseforge.com/_next/static/chunks/0iqch-~c4h.t_.js"],"default"] 59:T549,

LibBossIDs-1.0 provides a table that flags mobIDs true if the mob linked to the ID is a boss.

Example:

if LibStub("LibBossIDs-1.0").BossIDs[tonumber(mobID)] then
	print("Found a boss!")
end

One can get the mobID from a GUID in the following way:

local _, _, _, _, _, mobID = strsplit("-", UnitGUID("target"))

Target macro:

/run print(tonumber((select(6, strsplit("-", UnitGUID("target"))))))