In Jain Dharma, there is no essential “jaal” specifically for Tirthankars.

Tirthankars are generally described through:

• their lakshanas,
• pratimā features,
• and divine symbols like samavasaran, chhatra, chamara, and prabhā-maṇḍal in iconography.

So if by “jaal” you mean a special net-like mark or compulsory feature, then no, it is not a standard or necessary attribute of a Tirthankar.

If you meant some other word or ritual term, it may be a different Jain concept.