OpenRouteService successfully routes via the underground passage, hence I will close the issue. Likely someone connected then in the meantime. Thank you for your attention to details for pedestrian navigation!

Link to ORS to check:
https://maps.openrouteservice.org/#/directions/16%20%D5%8F%D5%AB%D5%A3%D6%80%D5%A1%D5%B6%20%D5%84%D5%A5%D5%AE%D5%AB%20%D5%BA%D5%B8%D5%B2%D5%B8%D5%BF%D5%A1,Yerevan,ER,Armenia/Lebanon%20Shawarma,Yerevan,ER,Armenia/data/55,130,32,198,15,97,4,224,38,9,96,59,2,24,5,192,166,6,113,0,184,64,22,124,3,160,21,128,70,1,153,240,13,130,138,7,103,160,78,18,2,97,32,14,0,105,240,1,136,178,244,201,48,161,210,171,122,37,241,48,13,200,84,153,124,130,88,76,146,218,143,126,131,132,137,164,223,9,67,20,65,113,1,0,3,170,120,17,19,97,202,0,23,148,0,182,184,200,105,14,122,4,0,102,240,0,219,162,224,128,249,66,160,2,208,3,187,35,248,3,89,32,3,152,154,123,67,160,251,162,166,33,129,5,226,166,67,59,59,162,34,195,162,192,128,2,251,149,0,0